HSF

is the shortned version of the words "Hedda snik fis", used to refrence a sneaky fart from hedda

*smells bad*
Bro 1: what is that smell?
Bro 2; i think its a HSF, bruh.

SF

SF is a saying in norway wich the closest translation in english is sneaky fart. silent but deadly.

Oshit is she a SF?

Did she just pull a SF? Smh