|1.||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.