FAG,
to Beat; as, Fag the Bloss, Bang the Wench; Fag the Fen, Drub the Whore. Whence [[to Faggot, next entry]].
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
The Vulgar Tongue originally collected by Grose, 1811.
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).