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1.
When you are utterly disgusted and/or in disbelief you put your lips together and expel wind from your pursed lips making a quasi flatulence noise to demonstrate how you feel about what you just heard/ witnessed.
William: "So I totally banged this ten last night, Giselle quality, if not hotter, seriously"
Michael (blowing wind): "phhhhhhhh! ya right, there's no way you could pull that off......."
by wsimmo January 23, 2009