When you solidify semen by freezing it into nuggetshape, then insert it into a woman's anus, waiting for it to melt and leak out before being served to the man eating ass.
Person 1: Last night, my girl made me some tasty anal nutnuggets, it was great.
Person 2: Damn, I wish my girl would dare to do something more than feet shit.
One who finds great pleasure in farting;releasing noxious fumes from their ass to the point where they either drop a buttnugget in their pants or on the floor
Keith: Oh man! You smell that?
John: Yeah, you need to go the bathroom!
Keith: No, I'm good for now. (keith farts again). Wow! That one felt good!
John: Dude! Go to the bathroom!
Keith: I think I'm done. (keith farts one more time). Oh wow! That one felt great!
John: Keith..one more time - go to the bathroom!
Keith: Oh man.. I just shit my drawers
John: You're such a masturbatorial buttnugget.
Keith: I'm going to the bathroom now.
Small piece of fecal matter left lodged in anal opening when defacation does not exit in a generally whole piece. Usually requires tissue to dislodge or waiting of gravity to dislodge itself.
John has to wipe his ass several times because when he shitted, he was left with a buttnugget