Definition: a belch which tastes of meat
There are some bad words in the nid- section of the alphabet. The word nidor may describe a strong smell, but is especially used to refer to “the smell of cooking or burning meat or fat”; the adjective nidorous is defined as “smelling of or like burning or decaying animal matter.” As unlovable as these words are, they pale in comparison with nidorosity, which was memorably defined by Samuel Johnson as “eructation with the taste of undigested roast meat.” And however objectionable you might find this concept, you must at least admit that the word nidorosity itself is rather more pleasing to say than meat-burp.
I have been within the influence of their nidorosities.
—James Beckett, Remarks on Conversations Occasioned by Mr. Burke’s Letter, 1796