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1 definition by Lawrence of Doncaster

 
1.
The art of masturbating when others are present without being noticed, therefore, fapping on the shady.
He's got his Public Masturbator Trenchcoat on, he must be going for a shady fap on the train.

I had a shady fap at the cinema last night.
by Lawrence of Doncaster June 07, 2009