Totally insane; insane enough to fuck a bat.

May be used adverbially as an intensifier (e.g. "batfuck crazy") or on its own as an adjective.
You little sister is completely batfuck crazy. She was trying to smoke a coathanger.

Yea, she's totally batfuck man.
by Pipe Downn October 10, 2008
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n. a social event or dance to which the gentlemen involved invite the ugliest skanks that can be found in time for the occasion. A prize is usually awarded to the guy who brings the broad judged worst.
"Hey John. What say we organize a batfuck for Saturday night next."

"Kewl man! We haven't had one of those since last spring, and I know just the perfect hog. Yowsa!"
by Ragnarok7 April 9, 2007
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John batfucked Sally. Therefore sally got fucked by a bat.
by George March 29, 2005
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Sufficiently mentally unstable to attempt intercourse with a bat.
Dan Quayle is an ass clown, but his wife is batfuck crazy.
by lex November 25, 2004
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Said when a confluence of thought and/or action occurs during a conversation between two or more individuals. See: Poke, you owe me a coke, or the concept of a jinx, but without the imposed silence inherent in existing concepts.

This pejorative should be shouted and/or typed at any moment when both parties involved in a conversation type or say what is essentially the same concept (with allowances for differences in wording).

The declaration should especially come into play when this confluence occurs at several moments in the same conversation; the first instance might be unique, but three or more would justify loudly shouting "BATFUCK AND MUSTARD" from any available rooftops.
A: I consider the cantaloupe to be an unnecessary fruit.
B: I no longer require cantaloupes in my repertoire of melons.

A and B (unison): BATFUCK AND MUSTARD!

B: Indubitably.

A: I need a beer.
by unsquare May 31, 2007
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To do what studybudy did to Spence on July 13, 2018. Synonyms: Raped, Fucked, Anally destroyed
Damn, Piper Perri just got BATFUCKED
by StudyBudy2.0 July 15, 2018
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