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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 04, 2005
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2
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 03, 2010
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Gymrat; Noun: A word used to describe an individual who is addicted to lifting weights. Gymrats have well developed physiques and broad knowledge of training regimens and diet plans. Gymrats are not the same as meatheads. Gymrats are much more intelligent and often have a physical addiction to lifting weights.
Bob: “Dude Sam’s a total gymrat.”
Jim: “I know he lifts like 20 hours a week.”
Bob: ‘He has no life.”
by cortez7 October 14, 2016
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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 March 07, 2016
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5
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 24, 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

Gym Rat: FUCK YEAH!!! TIME TO WALK AROUND AND ACT LIKE A BOSS
by Biggest Boss Thus Far June 27, 2010
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7
People (usually man) that are always in a gym. They workout more than any person and more than the healthy limit. They are always comparing their arm sizes. They usually talk how the other are hot and thinks like that, but they are not (at least they say it) homosexuals. A gym rat will always be a liferuler, though a liferuler is not necessarily gym rats
gym rats, liferulers, academy instructors, football players, bullys
by filipekiss February 17, 2009
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