"You'
re a Fuck"- Online Chatting Expression, much like STFU, that denounces a person as stupid, tool-like, idiotic..........basically a fuck. Common substitutions include You'
re a Fruit, You'
re a Fool, and other PG-
13 language. "Yo" is commonly added to the front of the expression, leading to "Yo You're a Fuck", or YYAF.