When you have to take a dump so bad you can feel the turd start to peep out of your ass. Derived from the ground hog peeping out of the ground to see his shadow.
by Bogga Red April 5, 2007
by nick January 6, 2004
When you have to take a shit so bad, and so large that it starts occasionally peeking out of your butthole. This usually occurs when your diet is mostly composed of meat. Not to be confused with prairie doggin' it, ground hoggin' it is much larger than prairie doggin'.
by elconyado September 9, 2011
When two people put their assholes together and one person shits into the other persons ass. Also known as the Subway Train.
by SlayerMeltdown August 18, 2013