The act of two people pooping at the same time, on the same toilet. Imagine a guy sitting on the toilet pooping, and a girl sitting on his lap pooping through the triangle hole his legs make with the toilet.
<cited from "One Flew Over the Cuckoo's Nest" (Signet paperback page 190) - Ken Kesey, "...legs long enough to lock around his mighty back , and a little cup of poozle warm and juicy and sweet as butter an' honey...">