much like a blood clot, fecal matter may clot in your ass, causing an assclot.
danny got his stool pushed in by some gay dude the other night...LOL what an assclot!
The clogage of someones asshole. May be caused by a variety of things. Also used as an insult in certain cases.
That mandarin buffet gave me an assclot the next morning so I drank a tea spoon of ex-lax.