"What the fuck are you doing mother fucker?" Similar to asking the question "wtfrud" but conveys more attitude and excitement. One might use this when setting up a night of heavy drinking.
Acronym for "What The Fuck, Urban Dictionary?" Describes the question many find themselves asking when they see a UD: Word Of The Day that is utterly humorless and boring, and you proceed to wonder why they rejected some of your best chuckle-inducing past submissions to the complete piece of shit you just wasted precious eye energy reading.