zfax Share definition Flag An interjection. Frequently when one is mad and trying to understand what is going on. Derived from the abridged expression of "what zee fack!" (what the fuck). Zomg dude, our team just can't play defense! I know man! Totally! Zfax!? zfax by Joonyah April 28, 2006 0 0 Get merch Get the zfax mug. Buy Now — $32.95 See more merch