Top Definition
1.A species of cow found in the dense jungle of South America. Known for it's plotting and black and white nuclear warheads.

2. A mentally unstable person who moons everything that moves.
1. We crept through the jungle, occasionally catching glimpses of the megalomooniac.

2. We got mooned by a megalomooniac!
by Mokey19 May 23, 2006
5 Words related to megalomooniac

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