Forehead acne from wearing an old dirty hat. Usually formed in a perfect line matching the placement of hat brim.
Every time I wear that snapback I wake up the next day with hacne.
by Freq Mods November 4, 2013
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The line of acne a person gets across their forehead from sweating all day long in a hard hat.
Cheryl: I would be a construction babe if it weren't for this insane Hard Hacne.
by BAJohnstonIsMyWeekendDad June 27, 2010
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