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.

when you're hungover as shit after a spending a night drunk as a skunk

Someone who's fortitude is so weak they might as well be made of butter.

One sexy girl; also use word to refer to a fine peice of ass