Fecal matter which resembles the anti-infantry cannon ammunition grapeshot, which itself resembles a cluster of grapes. Contrast with the smooth, tubular shape of a typical, healthy bowel movement.
Barry's low-fiber diet was evident from the fusillade of grapeshit released in his recent bowel movements.
by Herr Stehpinkler August 24, 2011
1 more definition
The effects of drinking too much grape juice. Your shit turns green.
I drank too much grape juice and now my poop is green. It's grape shit.
by Boston BAUER September 06, 2008