Top Definition
A defecation (a "number two") so large that it breaks the surface of the water in the toilet. Named after the original Mauna Loa, is the largest volcano on Earth in terms of volume and area covered, and one of five volcanoes that form the Island of Hawaii.
"I had to go to the bathroom SO bad that I dropped a Mauna Loa"!
by DKWSea October 30, 2011

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