An expletive used in response to another person attempting a 'mansplanation' of the difference between ASTROLOGY and ASTRONOMY. Frequently used to interrupt long supercilious diatribes on science, the occult, and the distinctions between them, .
T: "You know, there is a big difference between astrology and astronomy! Star signs are part of astrology. Astronomy is..."
M interrupting: "Astrology, astronomy - what is the difference?"
T: "There is a big difference. Astronomy is based on science. Astrology and star signs is not but rather..."
M shouting: "ASTRO-NINNY!" End of the conversation.}
by Sleap Reeder June 10, 2022
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ninni is everything

ninni is amazing
by carolthq December 11, 2021
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by dingdong ur religion is wrong December 2, 2019
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A ghost (usually a nun) who is terrifying yet suductive.
Omg nicole you’re such a ninny!
by fishyfishy June 24, 2020
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a foolish boy specifically named kevin.
kevin you were acting like a ninny today. you silly boy!
by georgiamiller69 June 12, 2022
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