Blood of the Grograms
(The ). Taffety gentility; make-believe aristocratic blood. Grogram is a coarse silk taffety stiffened with gum (French, grosgrain).
“Our first tragedian was always boasting of his being `an old actor,' and was full of the `blood of the Grograms.' ” —C. Thomson: Autobiography, p. 200.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894