Definitions by Pole Snake

HHMF 

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

Peace out all
#HHMF

HHMF by Pole Snake May 20, 2022