it's on

it's on

1. (colloquial) A conflict is starting.
   • 1959: Girls Town (film)

     [A man from a competing gang throws a drink in Fred's face, just before a fight begins.]

     Fred Alger (Mel Tormé): It's on!

Used as an announcement of a (usually physical) fight between two increasingly hostile groups, typically stated by one of the parties to the fight.

• on like Donkey Kong

• bring it on

• Sinto, Tinos, Tison, Tonis, noits, oints, sit on