n. a party; a dance. (Probably from shindy = spree, celebration.) : What a fancy shindig! They even have glass glasses!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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"dance, party, lively gathering," 1871, probably from shindy "a spree, merrymaking" (1821), perhaps from shinty, name of a Scottish game akin to hockey (1771), earlier shinny (see shinny (n.)).