Halitosis (medical term, first coined by the Listerine company in 1921), dog breath (scientific term), breath odour, or most commonly smells like shit when they breathe are terms used to describe noticeably unpleasant odours exhaled in breathing. e; eating certain foods such as dead cats, skunks, or putrified carp; smoking wet diapers; and poor marital hygiene. Morning breath is a typical example of transient bad breath which, strangely enough, occurs in the evening after performing salacious oral lubrifellicities.