HAA Share definition Flag A female's ass that needs high-heels to "pop" or "lift" but is flat when wearing flat shoes (flip-flops, sneakers, etc.). Short for "Heel-Assisted Ass." Paris Hilton has a HAA, J-Lo has a non-HAA HAA by NASCAR New Guy July 10, 2009 0 0 Get merch Get the HAA mug. Buy Now — $32.95 See more merch