Penis-in-a-box

When a male wears boxers and their penis pops out of the hole when they walk around with a boner.

Dude:dude, i had a boner watching underworld and got up to go get a drink, bad idea.
OtherDude:why?
Dude:cause it was a penis-in-a-box waiting to happen.
OtherDude: o shit! good thing i wasn't there!

by DaRTH TaNK June 01, 2006