The word "nina pop" usually refers to the recoil effect that happens after shooting a gun. So when people "nina pop" they are jerking their bodies like the recoil or "jerkiness" of a gun.
When the beat drop, make your body "nina pop."
by Sunny Capri November 16, 2003

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Top Definition
dance move popularized in St. Louis, similar to chickenhead; name originated from body moving like it'd been shot with a nine millimeter (nina)
"Nina Pop wit' it!"
-- Da Hol 9
by B. Chips May 13, 2005

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