1 definition by Quacking
In multiplayer games, a character who is indeed OP but it is not yet recognized by the playerbase as such. Usually one or two buffs away from being broken.
Player 1: I rarely ever see Swain in games but when he's there he always stomps
Player 2: He's definitely sleeper OP
Player 2: He's definitely sleeper OP
by Quacking August 23, 2017