Monkey Mustard is when you fart so hard you shoot out globs of shit. Similar to shart.
Becky: -LOUD AGGRESIVE FART- (also sounds bubbly, and sounds like when you squish flarp.) Keisha: OOoo girl you definitely just shot out some monkey mustard.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.