Top Definition
While a person is in the act of yawning, you vigorusly move your arm in a jacking off motion into their mouth, as if your giving a cumshot. Also remember the word Joffing.
Chris- "Dude you better not yawn! or im going to cockinyawn the shit out of you!"

James- "Dude, that would fucking own me"

Greg Cole- "Greg Cole Here!!!!"
by Ronald P. Bund December 18, 2009
4 Words related to cockinyawn

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