Tail Sniffing Share definition Flag When you are driving and the person driving behind you is riding your ass, but won't pass you. AKA "Tail-Gating" The douche in the porsche behind me today was tail sniffing. Tail Sniffing by G-Rilla August 2, 2010 0 0 Get merch Get the Tail Sniffing mug. Buy Now — $32.95 See more merch