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The act of occluding the tip of ones penis with your thumb when you ejaculate at last minute, in the same manner you would if covering the end of champaign bottle or garden hose. Thus spraying the female/male recipient in the face with an unexpected, unpredictable goo splatter.
I spiced things up a little bit last night and gave Lisa the San Diego Champagne Suprise when I came on her face. She didn't see it coming.