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1.
(1) A hideous troll creature who preys on weak men.
(2) An insult used towards someone acting like a whore.
You are such and essjay" or "Don't be an essjay
by Running Refridgerator June 26, 2011
 
2.
to present false information about oneself or to assume an identity other than one's own (after former Wikipedia employee Essjay)
Personal ads are a common medium in which people essjay.
by Essjay December 05, 2007