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When you are over worked or in deep trouble. It is a variation of "knee deep in shit" but adds the assumption that it takes longer to "get" knee deep is pelican piss then it takes to with shit, thus you have been over worked or in deep trouble for a longer period of time.
I am having a long day, I am knee deep in pelican piss over that late report!
by TJM3460 June 01, 2011