look up any word, like smh:
 
1.
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."
by dreyer December 17, 2007