a totally kick ass ska band that no one has heard of. if you ask people if they listen to mustard plug, they look at you as if you had the word "dumbass" stamped on your forehead.
She admittedly ate Taco Bell before our date, and as it turned out, I gave her the ol' mustard plug the next morning.
By Clarissa
Mustard Plug
A small preliminary shit that, once expelled, gives way to a large volume of feces. It resembles and reminds one of the crust of dried mustard that forms on the cap of the bottle which must be voided before the main mass of the condiment can be squeezed out.