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1.
A phrase used to negate something that you just said so that you can then say what you actually think.
Larry: The book looks great, Jason. Having said that, I would consider it more of a pamphlet than a book. It's looking a little thin.
by Brantski November 24, 2009
 
2.
A phrase used to completely negate what you said before. It is often used by an individual who is weary of revealing their true feelings on a subject matter.
Jeb: I'm not a racist but having said that I think all non-white people are dumb.

Jeff: So you are saying you are a racist...

Jeb: Yes. Absolutely.
by RedBeard53 November 24, 2009