When a male or female has to defacate, and a stranger penetrates their anus with a hard or sharp object, smashing the once solid poop into a mashed up liquid mixture. Usually results in pain and inability to work or do physical activity, along with runny poop for at least a week.
Nick: Hey Joe, How's it going?
Joe: It was going good until Cameron gave me a butthole abortion.
Nick: Dude that sucks, you won't be able to start pitching for the game on Wednesday
Joe: I know, Cameron's really gonna get it this time!