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2.
UK : To make your car into something it shouldn't be. Such as your typical granny shopping cart runnaround having air scoops, quad exhausts, 18" alloys.. and it still is a 1 litre effort.

Comes from a chain of vehicle shops in the UK.
Vauxhall Nova 1 litre? Hmmm. With quad exhausts, and 20" alloys? Major case of halfordness if you ask me...
by Crivens April 21, 2005
 
1.
if you like judas priest (the band) and sad that rob halford left the band you should know this word!!
now halford is gone the music don't have the same halfordness!!
by FIEF May 07, 2003