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1.
A particulary frustrating and obnoxious person who exhibits douche-like qualities, for whom other insults just don't capture the essence of his assinine-ness.
Hey douchenstein, clean your dishes.
by Chern October 27, 2006
 
2.
A unit of measurement for use with a douchometer in calculating the precise level of douchism a particular object or potentially douchebaggish person may exhibit. Part of the standard metric system, especially when used in places that use the metric system.
I can see you clearly through my douchometer, and you're registering at least 6500 Douchensteins.
by codyandgarrett October 20, 2009