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.
Your mom is my fat tire bicycle.
by The-effin'-man January 26, 2010
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.Buy the mug