Abbreviation for "Holy Shit, That's Karen as Fuck." Often used to express surprise and admiration when Karen gets close to out-Karening herself. Pronounced "hist-calf."
A: "Yo, did you hear what Karen did at Target? She tore down a whole display of facemasks and then when the cops showed up at her house she claimed to be the spokesperson for QAnon."
B: "HSTKAF."
B: "HSTKAF."
by Dayou Balimi July 05, 2020