(With either male or female partner - U.S.S.R can only be done by a gay couple).

The guy lays down and the other partner squats as if they're going to ride him cowboy style.

As the top partner comes down on the dick for anal, that person starts taking a dump so that the shit comes out and is then pushed back in by the dick they're sitting on.

Also see U.S.S.R for the Ultimate Soft Serve Reverse.
Yeah, I gave her a SSR, mmm tasty.

Gotta love the soft serve reverse.
by SSR124 December 12, 2008
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The San Diego soft serve is a sexual act that entails a young man consuming a series of laxatives, shortly after a young woman will reach through the young mans legs and pull down on his erect penis as he pushes out fecal matter in to her mouth.
Honey get the tarps, we are proforming the San Diego soft serve tonight.
by Rino1abc December 15, 2018
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<?> /me practises soft serve ;()
by informer May 11, 2003
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When a woman gets ice cubes and nesquick stuffed into her anus. Then a man inserts his penis into the anus and ejaculates thus mixing the contents into a creamy substance similar to soft serve ice cream. To finish this act, the man then dispenses the chocolately goodness into a cone by slowly pulling out his penis.
David: That St. Louis Soft Serve was good!
Tonya: Yeah, I guess my ass is good for something!
by Gag-on this November 28, 2007
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When a man ingests so much cocaine that cant acheive an erection then a woman gives him head
Man I was so blown the other night Katty had to give me a Columbian soft serve
by Satori0320 April 14, 2010
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Partner A lies on their back, with their mouth open. Partner B then defecates in the mouth, but swirling it upwards to resemble a soft serve ice cream.
"That girl is so hot, I want to give her the soft serve ice cream until she pukes."
by Lord Death Blog April 30, 2005
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