Someone who's constantly out getting dirty racing dirtbikes, running races, fourwheeling, etc.
Also, the line of dirt you get on your neck from being active outside, doing stuff.
"Hey, where's Danny? I thought we were going to that new oxygen bar this afternoon and then watching the box set of Friends?"
"Oh, he's up on the mountain running his KTM down the south slope - he's such a dirtneck."
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