When an opponent on checkers can't move his or her last piece, similar to checkmate for chess.
I yelled "checkermate" when she was trapped and she laughed and called me silly as she lost.
by SouloCutz May 1, 2009
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When you're playing online checkers with Vic and she is forced to crown you.
Erik: "Here I come"

Vic: "Oh no, you're heading towards my kings row"

Erik: "Boom, checkermate"
by Quenton2021 November 30, 2021
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