FLAG,
a Groat; The Flag of Defiance is out, (among the Tarrs) the Fellow's Face is very red, and he is drunk.
a Groat; The Flag of Defiance is out, (among the Tarrs) the Fellow's Face is very red, and he is drunk.
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Flag in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).