Top Definition
Acronym for "You're a fuckin' douchebag!"

Most properly used when texting or posting on facebook, or perhaps verbalized as "Y-A-F-D" when kids are around or in an extremely "proper" situation.
On facebook:

Jim: "Hey fb ppl, I was driving down the street after the big rain storm and came across a huge puddle. Went through it and splashed this old lady standin' on the corner! Ha ha, you shoulda seen her face!"

Billy: "Dude, you think that's funny? YAFD!"
by dookeyboy November 17, 2010
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