Top Definition
When a person by the name of Megan gets a vile attitude with someone else. Usually occurs when she is proven wrong, ignored, or not favored over another friend. Mostly makes an audio description of the high pitched sound of a whale and makes the face of a constipated bird. Originates from Sweden but only lasts for a few minutes before returning back to the actual MEGAN!
she needs to calm down with that megatude before she explodes.

by dafgrfga June 10, 2008
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