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It is the universal word used to poke fun at one another. May be used as a negative putdown or used as a light joke.
Hah! Jeremy just tripped, what a geenis!

I hate Fred! Hes just a little geenis!
by Aaron P M September 23, 2005
A term that is used for the bulge above a mans penis. It is where the gut meets the penis and is somewhat undefined and gross. It is the male version of a "gunt".
Wow, Ray has quite a sweaty geenis on him, doesn't he?

by Tom420 November 01, 2005
When a mans gut is so big it folds over and touches his Penis.
Dave kept hitting himself in the nuts with his Geenis
by Dilldo October 18, 2013