An ancient phrase used to describe defecation in both fluid and solid. The phrase is most likely from an ancient language spoken by the Egyptians.
The word is still used to some extent, though often only in upper class common tongue.
"Do you need to use the restroom?" "Affirmative, I'm in great need of letting go of neiri cheiri. "
Synonym for defecation. One might use the word to imply knowledge about the latin language, even though the word is made up.
Billy constantly smelled hirrible efter conusming cher.