foreverback Share definition Flag When a girl has so little of a butt that it appears as if her back goes on forever, hence, foreverback. Dude, look at that girls foreverback. She's got the ass of a 10 year old boy. foreverback by Loob Toob November 29, 2015 0 0 Get merch Get the foreverback mug. Buy Now — $32.95 See more merch