Stands for Hurensohn in swissgerman. (Son of a bitch)
This sbreviation was invented in the small town of Jonen and migrated out to the whole Switzerland.
HS means "Hurensohn" the german word for "son of a whore", "son of a bitch".
in German it means "Hurensohn" translated into English is that "Son of a bitch".
Guy1: Your such a HS
Guy2: *Sad Guy2 noises*