Similar to "prairie-dogging": When a turd leaves it's nest, sees it's shadow, and runs back in. This is a precursor to the "turtle-head", and should not be taken lightly. Short yet expedited steps in the direction of the nearest toilet facility are recommended immediately. A post-evac check of the surrounding areas will signal a possible 6 week extension of gastrointestinal discomfort.
Jay- "dude its like the stage before ... like its not prairie dogging yet...its like right before that."
Greg- "Oh! So its ground-hogging ! It popped out saw its shadow and ran back up in there."
When you have to poop really bad, but you are forced to hold it, and you feel like you are about to poop yourself.
The next bathroom isn't for an hour, and I'm already ground-hogging