1. typically after a large poo, see evolution of man; the follow up turd befor you leave the seat. This thin turd stays together but doesn't initially drop into the bowl. It may go sideways and hit the lid, doubleback and get your outer butt.
2. a wipe that should have struck paydirt, but ended up on your thumb or edge of hand. very messy.
I just too a huge crapper, and on cleaning up I noticed a poo askew! I had to wipe half my butt and the bowl!