eggshit Share definition Flag To act silly and giddy for no reason whatsoever, usually due to hyperactivity. Not to be confused with apeshit. Last night, I was babysitting my boss's son, and after a couple hours he started going eggshit. eggshit by Donald Juebitow July 1, 2006 0 0 Get merch Get the eggshit mug. Buy Now — $32.95 See more merch