Top Definition
when someone eats a series of food to make there poop green and then smashes their white asscheeks against a window and releases its green caca surprise all over the window resembling a pistachio nut. (green caca+white asscheeks= pistachio nut surprise)
i pistachio nut surprised my mom the other day and she broke the glass window making my anus bleed.
by RepGnar January 12, 2011
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