Its a combined definition of fat tire and bicycle. Fat tire is a fat chick that you bang in the belly button. and a bicycle is a slut. So a fat tire bicycle is a slut that is fat and you don't wanna fuck her pussy so you stick it in her bellybutton.
by The-effin'-man January 26, 2010
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See that lass at the bar ? Aye ! Well I bet you a tenner that if you Lift The Fat up you will find her last boyfriends living off the sweat lines .
by Wee mikey May 8, 2022
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I was hanging out with my friends today some of who are fat like me, but I can’t talk about my health goals that include the need for my personal weight loss. I think I need to come out as bi-fat.
by CRDSM June 4, 2018
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