fat fuck (verb) this meaning is having sex with a obese person male or female at least one of the people must be fat in order for it to be called fat fuck.
some obese kid: hey at least im not anorexic
some kid getting yelled at: ahah im not anorexic but i aint a fat fuck like you.
*fat fuck got pwnd*
nerd: i totally had fat fuck with tracy after prom
someone that isnt a nerd: yea w/e
Adjective - A word commonly used to describe unliked fat people who annoy the fuck out of everyone and can't take a hint or lose weight.
2) At Wendy's, the same fat fuck proceeded to order water with his 5 cheeseburgers in hope of eating healthier.