A floating fish is a dead fish, hence, an indication that a decision or idea makes an individual worse off.
Luis: "I think I'm going to vote for Donald Trump in the GOP primary."
Isabella: "Whatever floats your fish."
Isabella: "Whatever floats your fish."
by InRalphLauren August 15, 2015
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Whatever Floats Your Fish
• whatever floats your boat
• Whatever floats your boat, tickles your pickle, pops your peach
• whatever floats your duck
• whatever floats your goat
• Whatever floats your root beer
• Whatever floats your scrote
• Whatever floats your waterlogged boat.
• Whatever floats your waterlogged goat.
• whatever floats your yacht