Crusty Couch

A Crusty couch is a piece of furniture used frequently for masturbation.
This word is most often refers to a couch but it can also be used for a chair or a recliner.

Xavier: Hey Nathaniel, why don't you make you're self comfortable and have a seat!
Ali: Oh no! You can't sit there!
Xavier: Why not?
Ali: Dude, don't you know? That's my Crusty Couch!
Xavier: Aw ew dude! That's disgusting!
Nathaniel: I'm gonna kick your ass!