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In the same vein as 'whatever floats your boat'. This phrase is useful when talking back to bus drivers. It's the same thing as saying 'Whatever makes you happy', but this version is more sarcastic and rude.
Bus driver: I'm going to have to ask you to get off the bus. You are bothering the other passengers.

Milly: Whatever drives your bus, man.
by 333Emmaline May 10, 2010