The
m25?
( Tyronne Get To Falkirk, Sat 2 Jul 2005, 23:54, archived)

I suspect you are thinking of arterial
or anal.
( Enigmatic ™                 Voice No More                  ©, Sat 2 Jul 2005, 23:55, archived)

anal
nah not going south of the river at this time of night guv`nor.
( Tyronne Get To Falkirk, Sat 2 Jul 2005, 23:57, archived)