the act of cutting or shooting a hole in someone's head and sticking your penis in it
"That girl was so hot I'd skull fuck her!"
by Birrox February 11, 2015
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1) Something, usually a task, that is extremely difficult to perform and thus causes considerable stress as one feels completely unable to do it.

2) When a man lays on top of a woman and thrusts his penis into her mouth, often a violent action.

3) When one receives shot in the head, typically with a gun.
1) "For fuck's sake! That maths exam was a totaly skull fuck."

2) "Coming to mine for a skull fuck?"

3) "Heard about Johnny "The Hat" Bastardtooth?"

"Yeah, Billy the Arse pirate gave him a skull fuck."
by John Delonge April 08, 2006
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A dumb-ass, usually male and happens to suffer from S.D.S (Small Dick Syndrome) in which they must overcompensate with bad jokes that wreak of the desperate attempts of a guy with a major inferiority complex... WHEW!
Also: Dumb-ass, Fucktard, Nimrod and Wankmeisters.
Inappropriately named children's show character:
If I always make bad mom jokes beat on the sickly kid and am basically an insecure douche what does that mean kids?
Kids:
A Skull-Fuck!

OR

SF (skull fuck): You are gay
ASF (ANTI skull fuck): To put it bluntly you godamn inbred half-witted, club footed, blink 182 loving, music ruining, fucktard!... Fuck off...
by DBbonesMEMBRANE April 10, 2010
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Sex with penis aggressively entering partners mouth in and out.
I got skull fucked last night and my jaw still hurts.
by Bigvbear June 08, 2018
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1. When you're so high on certain substances that you mess up your brain.

2. If someone is making your brain hurt either by lying, manipulating, bitching, stressing you out etc.
1. Me and my mate got so skull fucked last night!
Oh my god I'm so skull fucked right now.

2. I just found out my boyfriend is sleeping around. My head's a mess. I feel totally skull fucked.
by misspseudonym January 27, 2016
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Any act of intercourse between two mammals scalps. This feels really good if you have long, dirty-ass hair, and you are a complete faggot.
Before I got on the airplaine I skull-fucked Tyler, and as a result I got dandralitis.
by Odyssey of the uterus September 24, 2003
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