The bunching up of a zipper so it appears as if you have an erection protruding from your jacket.
Jim had a jacket boner and we laughed at how small it was.
ayon kay Trevor Cobbs ika-24 ng Marso, 2008
when you are wearing a zip-up jacket of any brand

and when zipped up it looks as if the zip line has multiple boners because of the numerous humps.
could also look like vaginas in extreme cases
Ugh stupid jacket boners
ayon kay TheJacketKing ika-27 ng Enero, 2011

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