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1.
A combination of gandu, a Hindi word for an asshole or idiot, and douche, a shorthand for douchebag.
That guy is a gandouche.
by Dave K. November 14, 2007
 
2.
An insult pertaining specifically to anyone who thinks they are awesome because of their knowledge of Lord of the Rings, Dungeons and Dragons, or any other fantasy/mythical information.--combination of Gandalf and Douchebag
That guy is such a Gandouche
by lizzyrose October 04, 2010