The bushy overgrowth of hair on the neckline, typically indicating it's time for a haircut. A distant relative of the Kentucky Waterfall or the Mississippi Mudflap.
It's been 8 weeks since my last haircut; my neck lettuce is ripe!
by Greg Hendricks September 7, 2007
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Chips when put on a sandwich to provide crunch instead of lettuce or other vegetables.
by Bert the Dog March 11, 2019
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