DuckCorp Dico

Found one definition

1.                 From The Jargon File (version 4.4.7, 29 Dec 2003):
                   
   
   
                   
                     
   thanks in advance
   
       [Usenet] Conventional net.politeness ending a posted request for
       information or assistance. Sometimes written ‘advTHANKSance’ or
       ‘aTdHvAaNnKcSe’ or abbreviated ‘TIA’. See net.-, netiquette.