The medical phenomena of a person's breathe literally smelling like fecal matter; a derogatory term for someone whose mouth smells like intestinal waste, or rotting protein.
"Go brush your teeth you little turd-muncher!"
by The Dirty Mouth of the South September 26, 2010
A person who constantly has shit coming out of their mouth.
I can't believe you said that, you're such a turd muncher.
by Breezie's September 21, 2005