Definition from Wiktionary, the free dictionary
- (idiomatic, colloquial, bodybuilding) A person who spends a large amount of time working out at a gym and who may be obsessed with improving his or her physique. Often said of a gay man, but also said of women and heterosexual men.
2002, Dan Anderson, Sex Tips for Gay Guys, ISBN 0312288735, pages 129, 130:
- Unlike sex with a Leatherman or a Sugar Daddy, when you have sex with a Gym Bunny, you will probably have to keep reminding yourself that there are actually two people present. …The GB spends just about all of his spare time sculpting his ever-more-fabulous body, and just about all of his spare income on ever-more-skimpy gym outfits.