Green’s Dictionary of Slang

Gary Glitter n.

[rhy. sl.; ult. pop singer Gary Glitter, real name Paul Gadd (b.1940)]

1. (a pint of) bitter.

[UK]B. Kirkpatrick Wicked Cockney Rhy. Sl.

2. (also Gary) the anus [= shitter n.1 (1)].

[UK]Roger’s Profanisaurus in Viz 87 Dec. n.p.: Gary Glitter rhym. slang Arse. From Gary Glitter – shitter. See also council gritter.
[UK]I. Welsh Filth 301: Getting it up the Gary Glitter.
[UK]K. Sampson Outlaws (ms.) 94: There’s a big chunk of chopped tomato right in the middle of her Gary Glitter.
[UK]B. Dark Dirty Cockney Rhy. Sl. 59: Ask her if she takes it up the Gary.
[UK]J. Niven Kill Your Friends (2009) 65: Two hours later, I’m doing her up the fucking Gary.
[Aus]N. Cummins Tales of the Honey Badger [ebook] I decided to pull up stumps on the old Gary Glitter to initiate movement .