Etymology
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potluck (n.)

also pot-luck, 1590s, "meal accepted from another and made without preparation," from pot (n.1) + luck; with notion of "one's luck or chance as to what may be in the pot." As an adjective from 1775.

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Definitions of potluck

potluck (n.)
whatever happens to be available especially when offered to an unexpected guest or when brought by guests and shared by all;
a potluck supper
having arrived unannounced we had to take potluck
From wordnet.princeton.edu