when you masturbate with a dip (chaw) in your lip.
Joe: "Hey guys, I was thinking of going spike hunting and sitting on the biggest one! Wanna join?"
Bob: "Yea! Sounds like a swell time. Anthony come hold hands with me and Joe while we sit on tons of spikes!"
Anthony: "Sounds enticing, but I think I'll hold down the fort and chawsterbate while you and Corynn are out of the room."