Wow, Joey has one hard boner jacket.
by The_Fondler December 3, 2015
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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.
by Trevor Cobbs March 25, 2008
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A jacket boner is when your jacket zip pops up into the shape of a boner.
HAHAHAHAHA look that dood has a jacket boner
by connor holling September 12, 2019
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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
by TheJacketKing January 28, 2011
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