Top Definition
An excrement of epic proportions. Often performed in times of serious need to get out of something. The word comes from the Sumerian epic of Gilgamesh, where an ordinary man sought after immortality. However, a Gilgashit is not about immortality or man's internal struggle, but about the nature of bowel movement and the courage it takes to leave such a mark on society.
Kid A - "Dude you were gone for two whole periods--where the hell were you?"
Kid B - "Completing the epic, man. Gilgashit."
Kid A - "Brock-lock."
by Rileson July 22, 2006

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an epic saga, where rilesworth skipped class every day to take a shit on the toilet. after five episodes, ending in return of the jedi, the journey was completed and he achieved enlightenment.

also an excuse to skip a class or something important.
roswell: hey rilesworth how was the gilgashit?
rilesworth: ah it went fine, no tragedeees.

also:

rilesworth: hey i heard we have to run the mile today in pe. im gonna gilgashit that shit if you know what i mean.
roswell: i know EXACTLY what you mean.
by rilesworth July 25, 2006

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