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1.
Used to emphasise the fact that one has heard a piece of information, and whole-heartedly agrees with it.
Guy1:"Damn homey! Need'da get me some poontang tonight!
Guy2:"I heard that!"
by Banj December 20, 2004
 
2.
A strong agreement in response to a stated opnion, idea or fact. I want you to know, I heard you loud and clear and I understand you and I agree in fact and content.
A woman's statement:
Women today look extremely better and are much more educated than in the past.

A man's response:
I heard that!
by Ross Mcconnell August 30, 2006