Popular military phrase, especially in the Air Force, to voice approval of something or excitement.
Lt Jim: The F-22 is an awesome plane
Lt Mike: Hu-ah
Commander: We're going to bomb to terrorists back to the stoneage! Hu-ah?
HUA : (n.) a dirty, nasty, easy girl with no morals. One who goes through men in an instant, or one who tries to have the most sex. Someone who gives it up with anyone or anything. Someone who is a tramp.
Alex: "I'll have a bottle thanks, can you fetch the beer bong for me please Naki?"
All else present: "Hu-Ah!"