Top Definition
a moron, Jack ass ,door knob, fool
Dude, you put the key in the IGNITION Jack Knob
by LSULSUJOE October 25, 2006
5 Words related to Jack Knob
The act of a male ejaculating on another males face.
Timmy and Pumba jackknobed on each other.
by Ricky P. January 29, 2008
douche lord, jack off, fat fuck, shit eater, someone who is an overall rude ass
He called you a 9? What a jack knob!
by madsandtins January 02, 2015

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