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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.
batfuck by Pipe Downn January 20, 2009

beastfuck 

When you're fucking someone with such tenacity that they (and most likely you) lose the ability to formulate words or thoughts having to do with anything besides getting fucked harder, thus at the level of dumb BEASTS.
Oh, I beastfucked her. All she could do was make noises like a paint can being shaken.
beastfuck by Jack of Facts April 9, 2011
Exclamation of extreme distaste, used when a simeple "Fuck!" just would not do.
I hit my car with a bazooka!
Beanfuck!

beastfuck 

To have sexual intercourse with someone repugnant, usually in such a way as to avoid looking at them.
Tony: "Would you fuck her?"
Steve: "Hell no. She's a beast."
Tony: "Well, then beastfuck her."
Steve: ". . ."
beastfuck by Big Steve June 30, 2004

batfuck crazy 

Dan Quayle is an ass clown, but his wife is batfuck crazy.
batfuck crazy by lex November 24, 2004
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!"
batfuck by Ragnarok7 April 13, 2007