(french) literally half world, the English equivalent would be underworld. It is important to note that the final e is not pronounced in accordance with rules of french pronunciation. Has a pretentious ring to it.
Person A: Hey do you want to tag along, me and a couple of friends are going to the club near the center that opened last year.
Person B: I rather not, I heard rumors that the owners have ties to the demimonde and that it is a hotbed for drug addicts.
The realest nigga imaginable. Truly unparalleled in all areas. One of a kind. A remarkable human being. The object of envy. The standard to which we all fall short.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)