The way Slytherins greet each other and muggles:
Pleasant greeting from one Slytherin to a fellow Slytherin: Hiss, Hiss Motherfucker, shortened to #HHMF
OR
Hiss, Hiss Muggle Friends (depending on audience) also #HHMF
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)