Top definition
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!"
"Wow, that sure was a nice soft serve swirl, Steve."
by soft serve guy December 07, 2007
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