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1.
Something that is exclamed in the most suprising situations, if online must be typed without spaces in caps. If offline must be said loudly and very fast with no pauses between the words.

Is often accompanied by wide eyes and a gaping mouth.
Person one: Hey did you hear? They said terrorists are gonna bomb our school.

Person two: HOLYMOTHERFUCKINGSHIT!
by Wewoot April 21, 2010