When a person has to take a dump REAL bad, it wants to come out, but you force it back in with your butt muscles. Like a prairie dog poking his head out of his hole and popping back in over and over.
kid....DAD!!! You gotta stop at a gas station! I'm prairie doggin back here
Dad...be quiet and sit on your moms purse or something!.
When u have a humongo turd ready to come out but are no where near a toilet. It pops out and goes back in, like a prairie dog coming out of its holeabd going back in.
AKA:Turtle Head Poking Out
" man i got to take a major shit" other guys says " ohprairie doggin are we" and then u both laugh
When one's shit acts like a prarie dog, fanatically poking it's head in and out of it's home expressing it's urge to be freed from the confines of it's hole, but only when it is safe.
(See movie Rat Race)