Mad Beaver Disease. This is the beaver version of mad cow disease. The conditions include random, uncontrolled spasms which lead to violent attack of all things surrounding the subject. First encountered in the Panania area and in the local beaver stock. Currently there is no known cure.
by D.E March 18, 2004
Minor brain dysfunction. Mbd was what you called persons (often childs) that had adhd or add before it had its current name.
by Wennman April 24, 2017