To manually stimulate the penis with the hand, typically until orgasm. To masturbate. So-called because the foreskin on the uncircumcized penis, when not retracted, is said to resemble a bishop's mitre.
Ma caught Jimbo last night, playing beat the bishop. She opened the door to say 'goodnight' just as he was jizzin' all over the quilt!
by Tummy AuGratin February 24, 2006