Spurious
South London slang for "
fists". The action of giving someone an
uppercut to the jaw is, of course, like a
piston hitting the recipient's
chin. Used frequently in the
Culky columns of
PC Zone magazine around 1996, but possibly originating somewhere else.
Usage : "'E was givin' me some agro so I was sorely tempted to give him a taste of the old chin pistons."