droppin a beat 

To drop ones pants and masturbate profusely as in making music. In certain atmospheres it is popular to masturbate to the music of the pornography therefore dropping a beat. A.K.A Jacking Off, Masturbating, Choking the Chicken, Spanking the Monkey

Bob: Yo dude I heard this weird smacking noise in your room.
Jim: Yeah dude I was droppin a beat.
Bob: Gross you better not have gotten some milk juice on my keyboard

droppin a beat by D-Mo Money December 31, 2007

dropping a beat 

To masturbate so wantonly and so violently that one produces only a single bead of ejaculate that simply falls to the floor. Occurs with Duke students studying abroad that are having difficulty tapping dimes with tig ol bitties.

Dude 1: Dude 2, I almost got domed by this italian midget last night.
Dude 2: Damn man, that's cool... so do you wanna circle jerk now?
Dude 1: Yeah, just let me finish my kabob, my delicious delicious kabob.

"Scott was sleeping with his shoes on last night, so I dropped a beat in his mouth. Dropping a beat is awesome."

dropping a beat by Guelfa September 28, 2005