A sexual position in which the receiver is lying down face up, the giver places his scrotum on the top of their head like a cap, with their penis going down over the nose, like the nose guard of a helmet, ending with the head in the receivers mouth.
Can also be done with the receiver sitting and the giver standing/squatting above them.
Guy #1: dude when she laid down I so planted my junk on her head and gave her a nice sweaty skullcap!

Guy #2: Nice man! *offers hand for high five*
by N-Tako April 28, 2009
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The act of shooting someone in the head in such a manner that the top of their head flips off like a cap.
Man, I feel like skull capping some Nazis right now
by Diggit Buddy October 30, 2003
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slamming a chick from behind,and clocking her in the back of the head with brass knuckles right after you blow.
jennny didnt know she wouldnt remember any of this tomorrow. she didnt know tommy was going to skull cap her, and knock her sorry ass out.
by chris April 13, 2005
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