Top Definition
(a portmanteau of mental hyperventilate) To be overcome by an unstoppable flood of rapid, incoherent thoughts. Often leads to one of two verbal reactions: random babbling or frustrated, gape-mouthed silence.
When the company president greeted her in the elevator, Hillary hypermentalated for the entire length of the 39-floor ride.
by Paulito January 16, 2008
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