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1.
The solid boulder of poo that weighs you down in the morning due to a hearty dinner the night before.

Expelling a morning poo is a happy experience, making you feel refreshed and light on your feet. Doing a morning poo is an indication that you have a good day ahead of you.
"I feel so heavy and bloated this morning... better go do my morning poo."
by bear krills January 20, 2010