1. An idiot, douche bag, dumbass, or moron. Literally, a person who's is so stupid it's like their cranium is filled with jizz and no brain.

(Variant of numskull)
Dude: You brought me a Pepsi when I specifically asked for a Diet Pepsi, you cumskull!
by Mr. Filbert October 24, 2007
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A female who has no curves and only a pretty face.
“Bro Arianna is so flat I don’t I don’t even wanna pipe.” “Her face isn’t bad though just get head, she’s a cumskull.”
by kilometers17 June 01, 2021
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