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A Maderno Fountain is when someone gets on their knees and lifts their head up like a dog waiting for a treat. Then another person sits on their face with their butt on their forehead and their junk pointing at their mouth. They pee into their mouth and then poop a little cross on their forehead like a dirty Easter tradition.
My cousin turned into a Maderno Fountain during a bathroom break challenge.
At the party, Dave became a Maderno Fountain after drinking too much beer.
I saw my teacher do a Maderno Fountain during a very awkward staff meeting.