Online jargon, also known as text message shorthand, used primarily in texting, online chat, instant messaging, email, blogs, and newsgroup postings, it is spelled in all lowercase because it's also considered a form of leetspeak. AFAIK, David Spade made this one famous ;-)

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See also : ADBB  B4N  BB4N  BBB  BBBG  
NetLingo Classification: Acronyms and Text Message

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