Green’s Dictionary of Slang

tat v.1

[Hampshire dial. tat, to pat]

to flog, to thrash.

[Aus]Vaux Vocab. of the Flash Lang.
[UK]Metropolitan Mag. 14 330: He’s a poor crawling wretch, who works under the armpits, to be banded, and hour’d up in a swimmer all his best days, and then to be tatted.