Buttscrumble Share definition Flag Verb: Something you can do to someone else's butt, but not your own. You grap opposing cheeks, and just scrumble them as HARD and FAST as you can. New Tumbler Post: I buttscrumbled my cat last night and now I'm in the ER :( Buttscrumble by Sean Righe December 14, 2017 Get the Buttscrumble mug.