Top Definition
when your balls / crotch are sweaty and there is a physical steam emitting from your crotch area. Evil twin of swamp ass
I was at walmart and smelled something funny. I looked for the person wearing sweatpants as they typically go to the store un showered and full of nut fog and swamp ass!!
by UB78 January 19, 2014
4 Words related to nut fog

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