when someone drinks 200 ounces of liquid in one day, holds in the pee, and then pees on a hot girls tittys with so much pee that it looks like a little lake. Then you shit on the piss/titty lake and proceed to fuck the shit out of the girl with your face buried in the lake titicaca
When you take a giant diarrheapoop and it makes a puddle resembling a lake in her cleavage. If you lucky you get some drift wood or floating mystery corn.