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1 definition by Mrsronweasley

To be extremely happy or to become happy due to something that makes you happy.
When one is sad they may need to be happier and thus may need to happify.
Person: I don't PMS I PMH instead!
Person 2: What's PMH ?
Person: Pre Menstrual happify of course!
by Mrsronweasley June 20, 2007