upon finishing the activity of an "upper decker" (shitting in the upper tank of someones toilet) you then dump an entire bottle of dishwashing soap in the tank and then flush the tiolet so the bowl fills up with bubbling shit water....
Tom pulled an upper decker on Bills shitter, and I finished it off making it a root beer float!
is a type of sexual play that occurs when one partner has diahrea, either naturally or threw means of enema, and shits in a glass. Then the male partner is arroused to the point of ejaculation and creates a nice foamy topping of jism. Afterwards either partner drinks it.
Where one splooges into someone's mouth and then proceeds to drop a sloppy deuce into their mouth. If the density of the poop is greater than the splooge, then the splooge will float to the top creating the illusion of a root beer float.
Person 1: "Man I'm hungry for a Root Beer Float!"
Person 2: *fap*fap*fap* "Say ahhhh..."