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
by filipekiss February 17, 2009
when a man constantly gasses that he goes to the gym but hes built like a fuckin toothpick and still cant pull any shordies
jheez a man like kajan is a skinny gym rat, mans workout and is still a twig and the mandem cant pull bariah or lindsey
by BigBoyGang2 March 1, 2019
SAW DUDE SAW DUDE WUGAWAH GYM RAT JERRY
by greasypoo22 September 15, 2022