Noun. 1. An unusually large, solid bowel movement or portion thereof. 2. A person or thing which behaves in a manner reminiscent of an unusually large, solid bowel movement.
"That buttpumpkin got wasted, passed out on my bed and left a massive buttpumpkin in the laundry hamper!"
Jocular alternative synonym for "breast", referring to the human female mamma.
"Hey, juggalo, nice breats on that hottie over there!"