h.u.a. Share definition Flag Head up ass. Completely unaware of surroundings or consequences of actions. "Look at that H.U.A. driver! Figures, she's talking on her cellphone and not concentrating on driving." h.u.a. by H. East January 5, 2009 0 0 Get merch Get the h.u.a. mug. Buy Now — $32.95 See more merch