Victory! In your face! Used to announce an accompishment.

ORIGIN: Derrived from a 2011 FedEx commercial where a mutli-tasking senior mananger, while tatooing his own back, simultaneously defeats 2 chess apponents and announces "Checkmate, Sergei!".
a double play is executed in a baseball game, "checkmate Sergei."
by siliconsoapbox April 21, 2011
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