1736 Canting Dictionary / R / RUM-Bluffer [person,drink]
a jolly Host, Inn-keeper, or Victualler.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Rum Bluffer in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).