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1.
(from Investopedia.com:) An infamous phrase uttered by Alan Greenspan in 1996 to describe the overvalued market at the time.

Really, it means you're way too happy about something.
ME: Holy crap, did you see that?!
DUDE: Man, you got a problem with irrational exuberance. STFU.
ME: THAT KICKED ASS!
DUDE: Seriously, STFU!
by pinano July 14, 2004
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