When you shit your pants in the car after a rough outing at Arby's but you wait several exits to pull over and deal with it, leading to a meancase swamp ass.
Oh god, pull over man, smells like someone ripped a dirty richie up in here!
Someone you have sex with that is not only unattractive or obese but smells or is sweaty. A fun ride in the sack nonetheless, that is until your friends find out.
'Ohgross that dirty moped smells. I would still give it to her though, but no one must ever know of this"