The point when you have become so close with someone that you want to share every moment, even taking a piss. The woman sits on the toilet spread eagle, and the man urinates between her thighs. Also, a great hobby for couples stuck in a rut.
Him: Babe, gotta pee!
Her: Me too! Let’s try out tandem urination!
by Stoner Kathy November 20, 2017
Get the Tandem Urination mug.