Top Definition
The liquid that shoots out of a mustard container when you're expecting mustard, and not mustard juice/liquid.

This ruins a sandwich, even though you may have taken the percaution of squeezing it over the sink before your sandwich.
"damn, I made an awesome sandwich, but then I topped it off with mustard, and I got a nasty mustard shart instead!!"
by chipoperson February 12, 2010

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