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Defined by sticking an index finger in someones colon during defecation and rotating your fingers so that the fecal matter comes out soft like soft serve ice cream and placing it on the face or chest but doesn't occur unless your in Seattle.
1) Dude, you just got served some soft serve

2) Dude what the fucks on my face?

3) I want some of your SSS in my face

4) I like some Seattle soft serve on a hot day
by Seattle soft server July 09, 2010