buttslammin' Share definition Flag Term of enthusiastic approval, usually pertaining to something of relatively minor importance. dude 1: Dude, they got cases of Papst for 8.99 over at Hagen! dude 2: Buttslammin'! buttslammin' by Skid Mark VZ June 4, 2007 0 0 Get merch Get the buttslammin' mug. Buy Now — $32.95 See more merch