Etymology
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corker (n.)

"unanswerable fact or argument," 1837, slang, something that "settles" a debate, discussion, conflict, etc.; hence "something astonishing" (1880s). Probably an agent noun from cork (v.) on the notion is of putting a cork in a bottle as an act of finality. Corker in the literal sense of "one who or that which corks" is from 1880.

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Definitions of corker

corker (n.)
(dated slang) a remarkable or excellent thing or person;
that story was a corker
corker (n.)
a machine that is used to put corks in bottles;
From wordnet.princeton.edu