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A severe cramp that will occur in ones neck after playing on the floor hunched over a box of legos for an extended period of time. Can also be used to describe a neck cramp in different circumstances
"I've been looking for that antenna piece in this huge box for so long, I have lego neck."

"I wish we had sat farther back in the theater so I didn't get this lego neck."
by Tim Moen September 27, 2007
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