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"one who acts as a decoy for a gambler, auctioneer, etc.," 1916, probably originally circus or carnival argot, probably a shortened form of shillaber (1913) with the same meaning, origin unknown. The verb is attested from 1914. Related: Shilled; shilling.
Drunk: We'll eat good, then we'll get shikker
[1898+ Australia & New Zealand; fr Yiddish fr Hebrew shikkur]