1. 
   BTDT
   Been There Done That, details ...
   Found op http://www.cryer.co.uk/glossary/b/index.htm
   
   
2. 
   BTDT
   (In SMS-language:) been there done that
   Found op http://www.mantex.co.uk/samples/texting.htm
   
   
3. 
   BTDT
   Been There Done That
   Found op http://www.netlingo.com/acronyms.php
   
   
4. 
   btdt
   1) Blas abbreviation
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/btdt/1
   
   

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