E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Flam.
Flattery for an object; blarney; humbug. (Irish, flim, Anglo-Saxon, flm, flight.)
1
They told me what a fine thing it was to be an Englishman, and about liberty and property . . I find it was a flam.Godwin: Caleb Williams. vol. ii. chap. v. p. 57.