Top Definition
Noun - Medical condition for what happens when a person giving a blowjob gets the back of their skull slammed so hard that they lose short or long term memories of giving the blowjob that gave them the condition.
Yo man, I skullfucked your mom so hard last night she forgot we even did that. I think she has Whamnesia.
by chozo_ninpo May 26, 2011
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