mustard shart

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 13, 2010

mustard shart

When Tony eats an entire tub of mustard and subsequently shits his pants.

That Katz Deli Mustard Matt gave us was so good until I saw Tony mustard shart in his seat next to me.

by Bigg Body October 3, 2018