When you shit your pantsin the car after a rough outing at Arby's but you wait several exits to pull over and deal with it, leading to a mean case swamp ass.
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.
'Oh gross that dirty moped smells. I would still give it to herthough, but no one must ever know of this"