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1.
A person who totally, obsequiously agrees with everything another person says.
“During the meeting my boss Jeremy calls on Jason, who’s a well-known management echo chamber to ask if Jason thinks the Company’s new and much stricter internet policy is a fair one. The rest of us spend the remainder of the meeting retching at the resultant tsunami of blatant ass-smooching.”
by Dagrolord April 09, 2009
 
2.
an insular communication space where everyone agrees with the information and no outside input is allowed
The broadcast is just another echo chamber for self serving interests.
by The Return of Light Joker May 29, 2010
 
3.
A woman's pussy that is so stretched out of shape that if someone were to say something while going down on her,it would echo at least 3 times.
Damn Stephanie! What did you do, hump a cruise missile? This echo chamber is HUGE!
by Gollum May 24, 2006