I think it means you are pretending to be something you are not really.
"you big phoney, im onto you"
as in touchee
in the pink floyd song it's more of a cockney sounding rhyme...who knows?
Charade describes someone who is not what he appears to be, and it's usually done on purpose. Calling someone a charade is akin to calling him a fake or a fraud. It's the same word used to describe the game of Charades. (By the way, anyone who listens to Pink Floyd and watches South Park is a friend of mine!)
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