quadrashart Share definition Flag When four people simultaneously crap and fart at the same time making a watery poop-like substance in the underwear. "Dude I just saw Liam, Zach, Peter, and Joey quadrashart everywhere!" quadrashart by crazydrummer May 13, 2010 0 0 Get merch Get the quadrashart mug. Buy Now — $32.95 See more merch