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Bro science - Common "knowledge" that has been passed on through word of mouth and doesn't have any scientific basis.

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Newbie - A newbie is essentially someone who just started working out and has no knowledge about it.

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Bro split - A bro split is what most newbies do when they start working out at the gym. It involves training a separate muscle group every day. They usually copy the routines used by pro bodybuilders, or are advised by other people with degrees in bro science.

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Gym rat - A gym rat is someone who is always at the gym. You surely know who the gym rats at your gym are.

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Cardio bunny - This is the person who spends hours on cardio machines and doesn't touch a weight. 

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DOMS - If you workout, you're probably familiar with DOMS, or delayed onset muscular soreness. This is when your body aches for days after you exercise.

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Compound exercises - Also known as multi-joint exercises, these movements work a great number of muscles. Examples include the squat, deadlift, and bench press.

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Isolation exercises - Isolation exercises target specific muscles. They don't have the same impact on your metabolism and overall muscular development, but surely have their place in some workouts. For example, bicep curls and triceps extensions.

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ATG - The term "a** to grass" refers to a full range of motion squat, from extension to flexion.

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Cheat reps - A cheat rep is when you can no longer perform a rep with good form and cheat your way through the set. This can be due to fatigue or because you're handling too much weight. As a consequence, you try to gain momentum to perform a rep at the expense of good form.

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PR / PB - PB and PR stand for "personal best" and "personal record," respectively. These are basically two versions of the same thing. You can hit a new PB/PR in a variety of contexts, e.g. maximum weight lifted for a number of reps, or distance run on a treadmill.

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Meal prep - Meal preparation is essential if you want to keep track of your diet. It's a cheaper and healthier alternative to eating out too!

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Macros - Macros are a simple way to refer to macronutrients in food. More specifically, carbohydrates, protein, and fat.

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Bulking - If you hear someone say they're bulking, this means that they're on a hypercaloric diet and are trying to gain weight.

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Cutting - The opposite to bulking is cutting. In this case, the person is usually eating a hipocaloric diet and is trying to lose body fat.

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Spotting -

Spotting is when someone supervises another person while performing an exercise. This is to ensure safety as the person will have someone there if something goes wrong.

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Max out /1RM - When someone maxes out or goes for a 1RM (one-repetition maximum) it means they are lifting the maximum weight they can handle for one rep of a specific movement.

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Vascular - One looks vascular when one has pronounced veins. This is usually associated with a low body fat percentage as well as genetics. Some people simply look more vascular than others, even at similar body fat percentages.

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V-taper - This refers to the wide shoulders and back, which forms a "V." Many bodybuilders and gym-goers alike work hard to achieve a V-shaped torso.

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Mirin - Mirin is a short term for admiring. It's the act of admiring someone's body or particular achievement.

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Plateau - You hit a plateau when you can't go heavier on an exercise, or your body weight goals stall, for instance. It's usually a sign that something needs to change.

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Load / unload / rack - You load or unload a barbell when you put weights or remove weights from it. Racking essentially means putting the weights back in their place.

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Guns - Oh yes, the guns! Guns are slang for biceps.

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Shredded / ripped - When someone is "ripped" or "shredded" it means the person has a very low body fat percentage and a high level of muscle definition.

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Swole - Swole is essentially someone big and muscular. Most bodybuilders are swole.

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Skull crusher - Yes, the name is pretty dramatic, but it simply refers to a lying triceps exercise.

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Work in - If someone asks you if they can "work in" with you, it means that they want you to share the machine you're using, i.e. that person does a set while you rest, and vice versa.

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HITT - HITT stands for high-intensity interval training. It's a form of cardiovascular training that involves intense bursts of exertion followed by timed rest periods. 

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Beast mode - You surely have seen the t-shirts and the memos online. Beast mode is just another way of saying you're going full-on at the gym and are giving your best.

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Gains -

A product of your hard work. You gain muscle mass, increase your fitness level, and change your body composition through eating right, training, and appropriate rest.

See also:  Gym rules you should never break (but probably do)

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