GTFOOH

Get The F*** Out Of Here

This can be used to mean you are "putting me on", or to literally "get out of here".

Online jargon, also known as text message shorthand, used 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 : c ya  
NetLingo Classification: Acronyms and Text Message

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