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A person who often decides that he or she is going to know more (about whatever you happen to be talking about) than you know.
I was talking to Anna about my boyfriend the other day, and she kept correcting me about everything I said about him. She's never even met him! Ugh, she ALWAYS does that.

I know, right? She's always such an impulsive expert!
by AHHHHHHbekah. October 28, 2009
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