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You're out of control. Stop acting out of control, or Calm it down.

It comes from a board game in the 1990's by Parker Brothers, called Outta Control, during which a player would "Hit the buzzer" when someone was violating a rule.
You friend is acting crazy, or blowing things out of proportion and you say, "Hit the buzza"... it's like saying "stop, you're totally out of control."
by Calico79 February 13, 2012