When a person stands up partially while taking a lengthy shit to get the last few inches out. The person proceeds to sit back down while the lengthy turd hangs and the turd is forced partially back into the person's ass due to the end of the turd being pressed against the bottom of the bowl. A person who experiences this sensation/phenomenon has been "bowl raped".
A: Oh wow, I could go for a shit. It's been awhile. This one might be a record breaker!
B: Make sure you stay seated! Don't want to get bowl raped. Remember, two halves make a whole. No shame in pinching off midway.