Fap water

The water in a bathtub after you are done fapping in it.

I fapped in the bathtub and my mom told me not to drain the water because my little sister still had to take her bath. She promptly splashed around and gurgled my Fap Water. Julie, if you read this in the future, I'm so sorry.

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Fap water

Fluid or semi-fluid liquid that comes from either male or female genitalia when aroused.

Sara: "Hey, here is the map of the world showing the countries where tap water is drinkable."
Scott: "I don't care as long as I can drink your fap water when I get you wet."