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It means you’re totally stoned, like you just inhaled a cloud of weed so thick it could knock out a cow. People use it as a secret code so they don’t get caught.
Yo, I just hit H as F and my math teacher thinks I’m solving quadratic equations.
At home, I told my mom I was doing homework, but I was really just H as F.
In the lunchroom, I whispered H as F to my friend, and we both laughed like we were gonna die.