When you are wiping your ass and your finger slips off the paper causing you to scrap your fingernail against your asshole. - hence the name brown nailing
Person 1: hey bro what took you so long in there?
Person 2: ya my bad dawg, I was brown nailing pretty hard so...
Person 2: ya my bad dawg, I was brown nailing pretty hard so...
by Groundsack101 August 8, 2021
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