I was thinking about the phrase "I've got a turtle head poking out"

For those of you that don't know, it means that you really need to take a crap. So badly in fact that a turd is sticking out of your asshole.

I was thinking, however, what if you really had a turtle living in your large intestine that would periodically stick it's head out of your asshole. Would it snap at your fingers when you tried to wipe? I bet the turtle would have terrible breath.

Poop.