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1.
To excrete vaginal fluid out of the anus, usually after saying something witty and "douchey". There are many variations of this.
Math Teacher: "As you can see, my younglings, the answer is clearly the square root of 37! Or is it!? Muahahahaha!"
Student: "Wow, I think he just had a douchegasm."
by David October 11, 2005