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Translation: "That was far too witty for me to even begin to formulate a reasonable comeback of any sort whatsoever, so I will dismiss it in the time honoured (yet lazy) fashion."
It means when you farted, someone had ejaculated in your anus previously, and you ejected the come from said anus, which then floated to the surface of the hot tub.
You knew you hadn't farted your come out of your ass, since you hadn't farted. You were simply wondering who had.