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1.
Short for J Arthur Rank (British Film Producer). British rhyming slang for Wank.
I had a good J Arthur in the shower last night.
by Beanz991 August 15, 2006
 
2.
Background: London rhyming slang. Named after J. Arthur Rank, a twentieth century British film producer.

NOUN: Masturbation, or Wank. Rank provding the requisite rhyme.

NOTE: Besides the obvious rhyme origin, this piece of slang may come from the famous opening of Rank's films, which depicted a muscular man in a Toga banging a gong.
"Carmen Electra is so hot, I give myself a J. Arthur every time she's on TV."
by bernard leonard October 26, 2007