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1 definition by BenDangerwank

 
1.
A K-Penis occurs the following day/days after using large amounts of ketamine. The penis grows in length and girth, and erections are both more common and stronger.
"Shit mate, i had 6 wanks one after another before my stiffy went down. Its defo K-penis."
by BenDangerwank February 21, 2009
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