One who spends entirely too much time partaking in muscle building, strength training, cardiovascular, or aerobic activity. Specifically, one who does so at a health club or gym.

Often used derrogatorily by people who do not partake in or understand this lifestyle, some self-proclaimed gym rats use the term as a status symbol or for positive reinforcement.

Rare: The term is sometimes used with homosexual or dim-witted connotations, but both are entirely unfounded (the author of this definition is a gym rat, and does not fit these connotations).
I prefer to work out at home... I don't need to hang around a bunch of gym rats.

Look at those gym rats! They can name all their muscles, but I bet they couldn't tell you what an adjective is!
by Sabin February 4, 2005
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an extremely large and vascular mf or a small twig trying to become an extremely large and vascular mf. Usually pull 100s of bitches or absolutely 0; there is no middle ground.

Often too poor for a therapist, so decide to destroy their bodies to build bigger muscles to hide their feelings.

Listens to rap but will eventually turn to rock, then metal, and finally death metal.

Takes enough preworkout to kill a horse to sustain a gym session longer than

Will often prolong a gym workout to hope to catch the eye of a female, which won’t happen.

Also suffers from body dysmorphia and an Adonis complex.

In war with the gym bros, powerlifters and bodybuilders against crossfitters.
Crossfitter: Yo did u see that guy, he was here for 4 hours? He’s a psycho.

Gym bro: yeah he’s a gym rat, and pulls more bitches than you, you dumb crossfitter.

Crossfitter: what the hell was he listening to? Sounded horrible.

Gym bro: Slipknot, something pussies like you won’t understand.
by gymrat_24 February 21, 2022
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In terms of sports, if someone is called a Gym rat it is to be taken positively. Someone who puts in the work more than anyone else to become a better player, is considered a gym rat.
Sports commentator 1: Did you see that jump shot, fundamental skills.

Sports commentator 2: Yeah, hes a gym rat and puts in the work.
by Tyie April 3, 2010
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Gym rat= living at the gym/ always at the gym. Wow he is so strong he must be an eldon!!!!
by 1856 December 1, 2015
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also known as Chandler big gym rat he lifts more than his phone number and a notable contribute is Brian Lewin a beast at spotting that beastly man
the gym rat is hot

the gym rat has a 12 inch peen

the gym rat will steal your girl
by the gymrat is hot November 12, 2020
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Some one who goes to the gym everyday

Some one who continually post statuses on their facebook that they are at the gym
Facebook status "Yeah pumping iron at the gym"
Facebook reply comment "You're such a gym rat"

E.G 2:"Claudia is at the gym everyday she's turning into a gym rat"

E.G 3"I don't care if you go to the gym everyday I go 2 days a week like you're suppose to not everyday like you you gym rat"
by Harry69 October 25, 2011
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Someone who spends all their time in a gym but does absolutely zero excercise.
Gym Rat: God I'm so pumped for the gym, time to get fucking juiced!

Does one rep

by Biggest Boss Thus Far June 27, 2010
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