Green’s Dictionary of Slang

1. venereal disease.

1653		Urquhart (trans.) Gargantua and Pantagruel (1927) I Bk I 125: Dukes of Turnbank, Lowbuttock and Smalltrash, together with the Prince of Itches (Scrubbado) and Viscount of Snatchbit.
c.1698		B.E. Dict. Canting Crew n.p.: Scrubado the Itch.
1707		N. Ward London Terraefilius I 30: Hands, if gently applied [...] transport the Patient into a Tingling Extasie [...] That the Scotch Scrubbado is no Curse but a most Princely Blessing.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
1785		Grose Classical Dict. of the Vulgar Tongue n.p.: Scrubado, the itch.
1796		Grose Classical Dict. of the Vulgar Tongue (3rd edn) n.p.: Scrubbado. The itch.
1811		Lex. Balatronicum [as cit. 1796].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue [as cit. 1796].
1859		Matsell Vocabulum.

2. (UK Und., also screwbado) a general term of abuse.

a.1790		H.T. Potter New Dict. Cant (1795) n.p.: Screwbado a dirty fellow, a mean pittiful [sic] rascal.
1809		G. Andrewes Dict. Sl. and Cant.
1821		Flash Dict.
1835		G. Kent Modern Flash Dict. 29: Screwbado – a dirty fellow, insignificant.
1848		Flash Dict. in Sinks of London Laid Open.
1859		Matsell Vocabulum 77: screw-bado A mean, insignificant puppy; the lowest of the low.