you're on!

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you're on!

An exclamation of agreement to something that was said or that is happening, often (but not always) a challenge or a wager. A: "Want to see who can run to the end of the road the fastest?" B: "You're on!" A: "I bet you $50 that my team beats yours in the championship." B: "You're on!"
References in classic literature ?
Even when he's on the job, he plumb up and disappears most of each day soon as his work is done.
If yer does know him, and he's on de square, w'y I'll spiel yer de bunch of hot air he sent yer.