Green’s Dictionary of Slang

scrubbado n.

also scrubado
[SE scrub, ‘the itch’ + Sp./Port. sfx -ado, thus giving the term an underpinning of racist stereotyping]

1. [mid-17C–mid-19C] venereal disease.

2. [late 18C–mid-19C] (UK Und., also screwbado) a general term of abuse.