Back-Tha-Fuck-Up Share definition Flag Said to someone that is to close to you and you want them to move back. Hey Back-Tha-Fuck-Up Man you too close. Back-Tha-Fuck-Up by Tonky September 8, 2005 0 0 Get merch Get the Back-Tha-Fuck-Up mug. Buy Now — $32.95 See more merch