Etymology
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tiddlywinks (n.)

children's tile-flipping game, 1857, probably an arbitrary formation from baby talk, but perhaps from slang tiddly-wink "unlicensed drink shop" (1844), from slang tiddly "a drink, drunk."

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Definitions of tiddlywinks

tiddlywinks (n.)
a game in which players try to flip plastic disks into a cup by pressing them on the side sharply with a larger disk;
From wordnet.princeton.edu