krasstisch Share definition Flag German slang equivalent to American "awesome!". From the German "krass" (slang: rude) and "fantastisch" (fantastic). Das kommende Wochenende wir sicherlich krasstisch!! krasstisch by SMMKHF April 30, 2009 0 0 Get merch Get the krasstisch mug. Buy Now — $32.95 See more merch