Green’s Dictionary of Slang

‘a sturdy blade’ (Potter, New Dict. Cant, 1795).

a.1790		H.T. Potter New Dict. Cant (1795) n.p.: frumper a sturdy blade.
1809		G. Andrewes Dict. Sl. and Cant.
1821		Flash Dict.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
1859		Matsell Vocabulum.
1882		St James’s Gaz. 20 Feb. 6/2: The hustlers or frumpers who work in groups [...] take post on the footways in the darker parts [...] and engage in ‘chaffing’ sort of conversation.