The act of imitating a drummer, usually as to tap one's fingers on a table or dashboard, sometimes to tap your foot (usually for the bass drum effect), in sync to a song playing.
"Would you stop drummering to Pantera; it's getting annoying."
"Do you know who plays drums for Slayer?"
"Yeah, Dave Lombardo. Why?"
"Well, let's keep it that way. Stop drummering. Douche."