Green’s Dictionary of Slang

Brentford n.

[the Brentford bludgeon, either a specific type of club used by street robbers or a ref. to an electoral riot at Brentford on 8/12/1768; it was during this riot that Edward McQuirk killed one George Clarke with his bludgeon, thus the McQuirk in cite 1770]

In phrases

tip someone Brentford (v.)

(UK und.) to rob with violence in the street, to mug v.1 (2d)

Show quotations
British Palladium 33: [They] endeavored, by all the Strategems they could contrive, to get him into their Company (being all drunk) in Order to tip him Brentford or McQuirk him, mathematically.