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When one is drinking a beverage of any type and hears something ridiculously funny, it forces the liquid into the nasal cavity and throat and out the nostrils accompanied by choking, watery eyes, an empty drink and more laughter.

Note: Can be a slight bit painful if the liquid being consumed is an alcoholic beverage or a soda pop as it burns your nasal cavity a bit on exit.
"Dude stop making me laugh you totally just made me "Nasal Douche" with that last one and its burning my nostrils!"
by Born Flippy September 23, 2009
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