What is Shart-nasty?
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the act of farting but mistakingly ending up with a follow through surprise afterwards. however this surprise, aka defecating, is rather liquidy and has a tendency to run down one's legs.
"after a rough night of drinking liquor, bryan found himself dry heaving over a toilet the next morning. however, he was unable to regurgitate and all the built up pressure within his body resulted in a shart-nasty, giving bryan the opposite product from which he had intended. his pants were soaked and smelled funny."
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A sarcastic version of, "that wasn't very nice", "you shouldn't have said that", "ewww, grody", ..
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When you jack off and the belly button gets flooded with spunk.
Dude, i was jackin off last night thinkin of her n the mirky well overf..