fhyse Share definition Flag The word that Mark from Granda Hills Charter High School uses instead of "fuck" because he is too much of a pussy to cuss. Shut the fhyse up! I'm gonna come over there and fhyse you up! What the fhyse? fhyse by Matt April 14, 2004 0 0 Get merch Get the fhyse mug. Buy Now — $32.95 See more merch