It's heroin, but in a black, sticky, TAR like substance. It's more common and easier to get in Mexico, hence its name.
by Samantha July 1, 2003
Get the mexican tarmug. The smell of cooking mexican tar evokes the same symptoms i expereince right before vomiting: hot, runny saliva, nausea, gagging. It is so grossly pungent & foul, but the addiction overpowers this truth & I continue.
by tabitha November 3, 2003
Get the mexican tarmug. by Bassmasta4lyfe June 27, 2006
Get the mexican black tarmug.