Go on a Dirty

The act of going out to look for elicit drugs. Before you can "Drive Dirty" you have to Go on a Dirty.

Before the big party Steve and Sally needed to go on a dirty.

Go south on a dirty muff

When things just get really bad...

I was talking to a 10, when her 1.5 of a friend came over and cockblocked me...from there things would pretty much go south on a dirty muff...