- 1) The liquid that first squirts out of a plastic mustard bottle when you first squeeze it that has no mustard in it, just juice.
I tried to squirt a little mustard on my hot dog but all I got was some musquirt.2) The thin juice that separates from the rest of the mustard.
Awww! Musquirt all over my kielbasa!
Dictionary of american slang with examples. .