This nefarious sexual act requires the aid of 3 things; 1 person (gender inconsequential) with epilepsy, 1 strobe light, and 1 harness. Upon securing the epileptic person with the harness, the harness is then attatched securely to the penis of the meat shake reciever. The strobe light is then turned on, causing the person within the harness to have an epileptic fit. The shaking of the reciever's "meat", should cause him to ejaculate within minutes, probably ontop of the person secured in the harness.
Mark: "I wasnt too keen on Sally, until i learned that she had epilepsy."
Josh: "you didn't do what i think you did, did you?"
Mark: "Bro... i meat shaked the shit out of her."
Josh: "Classic Mark"