A sexual act whereby one man expells his payload into the the behind of another man who has a poop "on deck." The man with the goodies in his rectum squats over the other man, who in turn pulls on this man's erect penis, mimicking the lever of a soft serve ice cream machine. The feces/semen mixture is released, just like a chocolate/vanilla soft serve ice cream! The act is concluded when both men yell, "Soft serve swirl, coming right up!"
by soft serve guy January 2, 2008
Get the soft serve swirlmug.