butt-kicker(redirected from a butt kicker)
Someone or something that outshines or surpasses everyone or everything else. This new system is a total butt-kicker—we've never gotten so much done in one quarter before.
n. someone or something capable of defeating or surpassing all others. That idea is a real butt-kicker. He is an ass-kicker, but he at least rewards us for putting up with him.