The facial expression achieved when you're taking a gigantic size bite out of a hamburger/hotdog and you expect ketchup but itstead it's fucking loaded with mustard.
"You should have seen that kid's mustard face after I falcon punched him in the testicles. Priceless."
"That old woman had a perfect mustard face after I crop dusted that elevator."
"That old woman had a perfect mustard face after I crop dusted that elevator."
by Red Fingaz May 05, 2009
someone who is clearly pissed off, shitty and in a mood and it blatantly shows. They have a face like they have eaten a spoon full of mustard
by half baked Jake April 02, 2010
by Young Cat Meat July 30, 2009
by ExtendedMags February 17, 2012