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1.
To become excessively scared, angry or in some cases happy. Is said by many YouTube commentators, such as theRadBrad.
Man, playing Dead Space 2 makes me flip my shit every time.

If that chick over there keeps laughing, I might have to flip my shit!

When my dad bought the PS3 home, I flipped my shit!
by KateraChanChan August 20, 2011
 
2.
Too excited for something that you can't control yourself.
OMFG one of my long time favorite 90's show "Are You Afraid Of The Dark" is finally airing reruns. I just flip my shit. (:
by Princess90 December 30, 2013