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Fat is what a healthy baby is! Wah is the constant sound of it's crying! A FatWah is "a little fat baby crying."

A fatwah is a command from a dependent creature for those in hearing range to "come and take care of me." Everyone usually responds to the sound of a dependent baby crying. This is the root cause and response syndrome of the word FATWAH.
The commanders FATWAH had been uttered, and his team moved.

The parents heard the crying FATWAH in the outer room, they responded, knowing full well the FATWAH must be answered.
by Merrily McCarthy July 16, 2003