What is Poop or get off the pot?

"Poop or get off the pot" is a more polite way of saying 'Shit or get off the pot.' It's not very eloquent but it gets the message across. My parents knew all the dirty words and phrases but would say things like 'did you just let off wind?' rather than 'fart'. Saying fart in our home whenI was young was not a good idea.