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Old definition: madness induced by mercury fumes generated in factories that used this metal in hat fabrication.

Millenial definition: condition experienced by ambitious women who have to assume many roles in order to maintain diplomacy and harmony in a male dominated world.

The field of dentistry has confirmed the validity of this new definition by claiming that introduction of composite materials to replace amalgam restorations have shown no quantifiable impact on the behaviors of driven female practitioners.
My girlfriend has a mad hatter disease, Friday is always her second favorite F* word.
by Goldstar July 28, 2015
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