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A fart with some anal contents (juicy, chunks...) that gets sprayed on your underware.
Dude 1: So there I was in line at the grocery store when I had to fart.
Dude 2: Ya?
Dude 1: Well, my fart was more than a fart...I got some sputter butter...my underware was so messed-up.
by RNPS December 15, 2007