YAF

"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.

Person: Hahah your mother's a whore.
You: YAF you friggin tool.

by browwwnman November 18, 2009