The act of dispursing poo out of the anus. Slang terms include: pinch a mean one, dropping the kids off at the pool, taking the browns to the super bowl, taking a dump, lose some poundage, drop a load, etc.
Hey man, I really gotta Pinch-A-Loaf, can I use your bathroom?
To expel solid waste from the anus. Refered to in the movie "Shawshank Redemption".
guard: I'm gonna go Pinch-A-Loaf, so this stuff better be cleaned up before the wardon gets back