"Not telling you" is an expression you use when you want to piss off people by not telling them something the want to know.
Guy1: I had sex last night, want to know who I had sex with?
Guy2: Who? Who?
Guy1: Not telling you.
Guy2: Oh fu...
Guy1: Don't curse, mister!
by Fotus9 January 10, 2009
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A Southern United States phrase; it usually shows disgust or suprise with a situation or person.

Because the phrase tends to be used by itself, many people in the North US who hear it think that the speaker has not finished their sentence.
A, Southerner: "That Joel; I tell you what."
*a few seconds pass*
B, Northerner: "... What?"
A, Southerner: "I just TOLD you!"
by Leilani_h June 4, 2005
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A response to a possibly false statement that one gives when the party being responded to is certainly deluding themselves. Roughly, "If you keep saying that, you might actually start to believe it".
-She is not the jealous type
-Sure, keep telling you that
by James89898 June 17, 2013
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chiefly southern, esp texan. added at the end of pretty much anything, esp to add exclamatory sense to a clause. has a somewhat cryptic meaning known only to southerners. so you non-hicks, stop trying.
by yuan January 6, 2005
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A phrase commonly used by people in the South. Can be used in the beginning or end of a sentence. Common to Texans, it is used as a whole sentence, with nothing before or after it.
Bill Engvall talking about Texans: "Man, I tell you what."
"What?"
"I told you."
by Nicolee February 8, 2012
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