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Extremely simple: hard as fuck.
Adjective.
Most often used as a compliment of people who seem tougher or more weathered than others.
"All of us in suits man? We would look hard af"

"Dude, we are hard af in this"
by Seriousfool June 07, 2013
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2
Referring to ones penis when erect.
"Dude, I took a Viagra last night and my dick
Was hard af, no joke.,
Reply..."hard as 'blue' steel?!" (because Viagra's are blue pills)
by PhxSid March 22, 2017
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