Someone really stupid, sometimes, too stupid to realize his own stupidity. The current president of the USA, Donald Trump.
The president of the US is a complete nincompoop, a delusional idiot who thinks that the world revolves around him.
by libertarian against trump February 12, 2017
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A complete elmore, maroon or jackweed. Somebody with shit for brains. A fuck up of the highest order.
Bush elmored Katrina showing what a true nincompoop he really is.
by Mmmm Lewinsky September 26, 2007
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noun Slang term for anyone who is a devoted fan of Nine Inch Nails, or NIN, usually only used by other fans.
Only a true NINcompoop would watch the band's webcam for five hours, waiting for something to happen!
by Trogdor August 10, 2004
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A word in old english which is a classic insult a no brain a lil fucker something like that
by corrielovesya June 8, 2021
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Something I would call a friend if he/she should say summit stupid which is blatenly obvious!
eg.
louisa - i think i just saw a dog fly!
laura - dogs cant fly u nincompoop!
by marcush January 1, 2006
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Tyrone: "Boobshakapagloopadiggajopa"

Bob:" you nincompoop"
by The Sefbicer September 8, 2020
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"Dude, that guy is a nincompoop!"
"omg, hes so stupid, what a nincompoop."
by aylin22fertiz November 14, 2018
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