Top Definition
1. noun - refers to Nathan Goslin, for he has the rankest and most fetid diarehea sauce excreting from the sphincter during times of rectal exretions or anal intercourse.
2. verb - the act of accidentally excreting fartnagoo out of ones rectal cavity.
1 - tried to fart, but filled my shorts with fartnagoo...

2 - Better be carful or I'll fartnagoo!

*need for term created after he fartnagooed on the bus home after school, resulting in the discover of fartnagoo in his boxers in the form of self-proclaimed skid-marks.
by BigHornTM November 17, 2010

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