taken from the large, heavy duty ford produced motor vehicle differential of the same name this term is used to describe the largeness of a female's arse
'fuck, look at the nine inch on that!' or 'mate that's a fully braced big competition nine inch on that huge bitch' or simply 'niiiinnnee innnnncchh!!!'
by roron June 05, 2003
Term used to describe a woman's arse - usually dripping with fat and cellulite, that is massively disproportionate in size to the rest of her body - in reference to the large and robust differential seen hanging under the rear of some Ford motor vehicles.
'Man check the fucking nine - inch on that huge bitch!'
by R Yenarg August 01, 2005