Big Booty Tia Share definition Flag An aunt of a spouse or significant other that has baby-making hips and the butt of a goddess. Dude, you aunt is a big booty Tia! Big Booty Tia by MattC72011 November 27, 2012 0 0 Get merch Get the Big Booty Tia mug. Buy Now — $32.95 See more merch