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When one loses control of his or her legs while running at high speeds and they flail about uncontrollably till the person falls or regains control of their legs.

Commonly occurs while running down hill or while running on uneven terrain.
"Steve ran to catch the frisbee, but ended up spaghetti legging all over the place"
"Nothing sadder than a man spaghetti legging down a hill"
by TheyWinWeLose May 28, 2017
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