The kit bought from Halfords or similar motorist's chain store designed to make a modern car look stupid. Preferred modification of choice by Burberry capped townies. Usually involves body coloured 'skirts', and a large and pointless spoiler. Most commonly found on Citroen Saxos, Vauxhall Corsas and Ford Kas.
Term referring to a 'townie', commonly found wearing a Burberry cap, sovereign ring and driving a Saxo, Ka, Corsa, etc with cunt kit. 'Mush' is the noise made by the bass through the super-woofers in their car as it passes. See also chief.
Also a term used to salute a male stranger.
"Fuck off mush, who do you think you are?"
"mush mush mush mush mush" from speakers of passing car.
'Oi mush - fuck off!" - amusing song based on a 'mush' from a West Wales town.
Word commonly to address a male stranger. Also can refer to 'townies' driving round in their souped-up Saxos, etc with added cunt kit, as the noise of the bass of their music through their super-woofers sounds much like a repetition of 'chief'.