Whatever pisses your instrument.

A variant of the term 'Whatever floats your boat'.
'Whatever piddles your fiddle' = 'Whatever pisses your instrument'

Jade and David are deep into conversation:

Jade: No, I don't want more kids!

David: Well, Whatever pisses your instrument.

Jade: .. What?

David: You heard me.

Jade: .. You be cray cray.

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