closed as unclear what you're asking by RegDwigнt♦ Jul 20 '14 at 21:38

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Hmm. I use it more in chat to mean "I completely disagree with what you've just said". – user24964 Nov 18 '13 at 16:49
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It means exactly the same thing as when someone actually says it when you're speaking face to face. In other words it can mean a lot if different things depending on context and intonation (which admittedly is lost in email and chat) – Jim Nov 18 '13 at 16:52 
  	 	
@J.R.- I say it on several occasions. 1. When I want to say "I'm not sure I agree with you, but I don't think it's worth arguing about." 2. when I'm not paying strict attention to the person who's speaking and I realize they've just addressed a question to me and I want to indicate that I need them to repeat it. 3. when I'm in the middle of doing something and I just realize that I'v