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1.
When a man or woman shits into their partner's mouth and then proceeds to tickle their partner to cause them to laugh forcing the shit through their nasal cavities and shoot out of their nose, thus creating the effect of a chocolate soft serve ice cream machine.
My girl wanted some desert so I gave her some chocolate soft serve.
by Ingleburt Humperdink October 29, 2007
 
2.
When you moon someone and drop a duece.
"Dang, you ... I sidled up to that biatch and gave him a taste of the ol' chocolate soft serve!"
by Oldie McGrumpenstien November 16, 2005