In this case, emetica refers to the gastrointestinal "unpleasantness" induced by eating this mushroom. In other words, if you eat it, you will almost certainly throw up, undergo emesis, puke, ralph, buick, upchuck, hurl, heave, spew, have a TechnicolorTM yawn, toss your cookies, worship the porcelain goddess, or maybe even vomit!......Thomas J. Volk, University of Wisconsin-La Crosse.