slang for a prolapsed anus. also used to describe a prolapsed anus that has been left still connected to a penis after an anal sex act.
things must have gone awry, because his bumbilical cord was hanging out of his shorts when he left the brothel
When you go for a turd and the thing just won't break off, poo continues to grow in size without detachment.
Guy 1: I just had a huge bumbilical cord
Guy 2: oh man, how did you break it off?
Guy 1: I had to swing it till its own momentum broke it.
Guy 2: word.