A term used to say, "I'm glad that makes you happy, even though I don't get it myself." Although contrary to popular belief, the phrase is whatever floats in your boat, not whatever floats your boat. It is used the same way, but it is in fact whatever floats in your boat.
Whatever Floats Your Boat, Tickles Your Pickle, Pops Your Peach
The phrase used to confirm something when you are moderately indifferent to the actions of a friend who's mental faculties are questionable.
Person 1: So Im gonna ask Grey to marry me today.
Person 2: Didn't you just meet?
Person 1: So?
Person 2: Whatever floats your boat, tickles your pickle, pops your peach