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How hardcore a person is. Can be measured by: ability to mosh, ability to be sexy, and tendency to dress in scary band t-shirts, as well as other factors.
HXC Guy: dude, the concert last night was AWESOME, I got punched like fifty times in the mosh pit, but I got an epic Blessthefall shirt!
Fangirl: *swoons over intense HXCness*
by Fireflycities July 26, 2009
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