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4.
This is a recently popular expression of agreement that carries a subtext. It is more than agreement with an idea (observation, opinion); it is a friendly assertion that the speaker has already had the same idea–as in, "yeah, I know"–but it goes further: it seeks validation for the speaker's claim of precedence, from the very person whose claim he's jumping. The subtext might be "Oh, you took my idea; you should be agreeing with ME, not vice versa."
Student: I couldn't pay attention to the lecture because of that ball of sweat hanging from the professor's nose.

Classmate: I KNOW, right?
av justcary 4 december 2010
 
1.
An affirmation that you agree with or can relate to the preceding statement. It can be used whether the speaker actually knows or not, but in the latter case it usually means that the speaker can attribute the preceding statement to themselves as well.
"I got so drunk at the party that I puked when I got home." "I know, right? I think I might have barfed up stuff from last year."

"My parents are such trogs." "I know right? Mine think my LJ is a literal notebook."
av Kevin Fox 30 april 2008
 
2.
A way to express the concept of "yes" if you are not quite articulate enough to say that mighty imposing word.
"Some people can say entire sentences without communicating anything at all."
"I know, right?"
av Ben Carnehl 2 december 2003
 
3.
A way to agree with someone. Saying you had that same idea in your head.
Carrie: I can't belive Alvin cut her hair like that!
Lisha: I know, right?
av dicesha 23 april 2008
 
5.
The stupidest saying in the entire world and so less cool than that's real. Also shortened to "right?" because the proles who chose to use this word and too lazy to use proper English.
Jack: Dude, I just got a 50 percent on my math quiz.

Jackie: I know, right?

Jack: Wait, what?

av Carliz 20 mars 2009
 
6.
Preppy way of saying you agree with someone, without actually sounding too smart. Native to Northern California.
Becky, "I love brunch, it's hella cool"

Sam "I know, right".
av The apple of doom 10 juli 2008
 
7.
All of the other definitiions were missing one technicality that made them wrong. This expression requires and exclamation mark following the question. This statement is used when you are completely engaged in the topic of converation and couldn't agree more. To denote the proper meaning, a question mark should not be the last symbol -- this is not a direct quetstion and is strickly rhetorical.
Party #1: Blah, blah, blah...see that over there -- I want that.
Party #2: Wow! Oh my gosh, it's perfect!
Party #1: I know, right?!
av Truth-Talker 22 maj 2011