Lil thumper Share definition Flag A woman that lacks in the booty department . Someone that don't have lots of ass to offer. She's cute and all, but she got a lil thumper. Bring that lil thumper her and let me smack it Lil thumper by Hotrod305 September 6, 2017 0 0 Get merch Get the Lil thumper mug. Buy Now — $32.95 See more merch