? arbitrarily formed on the suggestion of foh int., or fog (n. flabby substance in the body, unwholesome fat), or alteration of hogo, offensive taste or smell
1823 - Slang. A Dictionary of the Turf, etc. (Jon Bee) John Badcock;
"Fogo, the same with a stench"
From: The Clockmaker;
or The Sayings and Doings of Samuel Slick, of Slickville
By Thomas Chandler Haliburton, 1884