Top Definition
a new drug that has been traced to Pittsburgh, Pennsylvania; the effect of this drug is to cause the user to go on a rape frenzy through physically and sexually aggressive behavior not normally exhibited by the individual using the drug

Another quality contribution to the world from Pittsburgh...
Yo dude, I heard Ben Roethlisberger is a mustard-head.

Hey man, you know where I could score some mustard? I'm fiendin...

Mustard (drug) is a drug causing a nationwide epidemic of drug-induced rapes.
by STOP THE MUSTARD October 29, 2010
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