Top definition
A cup (athletic) to protect a man's privates from unnecessary trauma.
-Holy Shit Mike, watch your low kicks. Thank god I was wearing my nut bunker.

-These nut bunkers don't protect shit, I had a bruise on my dick the other day.

-Dude, why are you wearing my sweaty nut bunker as a face mask?!?
by Jismoitekk the Enforcer August 13, 2006
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