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1.
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
 
2.
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