Green’s Dictionary of Slang

1. town, usu. the West End of London [rhy. sl.].

1992

R. Puxley Cockney Rabbit.

2. in pl., the knees [popular Cockney song ‘Knees up, Mother Brown’].

2002

D. Shaw ‘Dead Beard’ at www.asstr.org 🌐 ‘Come on, gal, your turn to perform,’ Monica says. ‘Get down on your mother browns.’.