The type of shits that come out with no internal form and that are extremely squishy, like butter that has been left out overnight. It has no structural integrity, so it slides out with ease and can be cut off with nary an inkling of effort.
Sometimes buttershits can be difficult to get completely finished with because the colon has a hard time figuring out how to thrust it out.
Oh God, I had the buttershits so bad! It was so runny that it just streamed down to the apex of both butt cheeks and dripped off from either side.
A female who is good-looking, but is a total bitch.
Note: BTW, coincidentally, I saw this term used somewhere else. Doesn't it happen pretty often that you think you were the first person to think of something where someone else had thought of it several years ago? :D
Guy No. 1: (points at hot girl) Isn't she hot?
Guy No. 2: She is hot, I gotta admit, but she is a total bitch.
Guy No. 1: Really? How'd ya say so?
Guy No. 2: Trust me, I was friends with her for a while. She's a total butterpersonality.
Johnny: Dayum, that girl is fuckin hot!
Joe: No man, check it out, she's a major buttertits.
Johnny: Ah, shit man. She's got that smokin hiny, perfect face, too bad she's as flat as a piece of paper.