Top Definition
When a man inserts his penis into a woman's mouth, then thrusts it back and forth in a vigorous "skull-fucking" manner, giving the woman a terrible headache, or sensation of having recieved a concussion.
"Hey Mike, do you get any from that fat chick last night?"

"Nah, I waited till she passed out then gave her one hell of a cockcussion."
by Double A Ron May 03, 2005
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