BTW

By The Way -or- Bring The Wheelchair -or- Booty To Win

It usually means "By The Way" but it can mean a few other things so check the context! Online jargon, also known as text message shorthand, used primarily in texting, online chat, instant messaging, email, blogs, and newsgroup postings, these types of abbreviations are also referred to as chat acronyms.  

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See also : FYI  FWIW  BRB  LOL  DBEYR  
NetLingo Classification: Acronyms and Text Message

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