The last piece of shit that just won't break off from your ass.
Damn it I got a hung bomb. Now I'm going to have to wipe it off.
A turd that comes part-way out of your ass then gets stuck, causing one to strain severely in order to pass it.
Jim: Damn! Did you see how red Frank's face was when he came out of the shitter?
Jack: Yeah, I bet he was in there trying to drop a hung bomb.