The act of an uncontrollable need to slap the person nearest you, resulting in an unfortunate muscle spasm which may inflict serious pain to those nearby. The tendency for this to occur often increases upon another individuals uncontrollable jellyfishitis.
Patricia was walking down the hall when suddenly Nik had a slapitis attack, resulting in Patricia's trip to the hospital where here jellyfishitis was cured.
by Slapitman February 07, 2011

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