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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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 8, 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 8, 2018
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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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Originally invented in the dirty 30's by Jacques Cousteau, and manipulated for personal use in the late 90's by some dude in Scotford. The Scotford Skull Fuck is an off-the-wall role playing sex adventure technique in which one person (usually the hot broad with the big lips and a tight ass) dons a SCBA (Self-Contained-Breathing-Apparatus) mask, purposely neglecting to attach the regulator. The other player in this sex-romp strips down to his skivvies and proceeds to insert his member (dong, penis, strap on, dildo, horsecock) into the SCBA mask mouthpiece. A full on face-fuck ensues for the next 37 minutes, until one of the parties involved passes out from pure orgasmic enjoyment... or over exertion.

The wearer of the mask then must lick up the salty mess and do the dishes after.
Crash: Hey dood, you ever role play before?
Christian: Yeah man, my girl diggs it!
Crash: Well I Scotford Skull Fuckked your girl last night while diddling her clam, and she did my dished after!
Christian: Bastad.
by BezEhBeh October 4, 2010
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