FLICKER,
a Drinking Glass. The Flicker snapt, the Glass is broken. Nim the Flicker. Steal the Glass. Rum Flicker, a large Glass or Rummer. Queer Flicker, a green or ordinary Glass.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
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Flicker in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).