A Modern Neanderthal is a person that thinks they are smart, but really isn't
Person 1: OH. MY. GOSH. GUYS I JUST DISCOVERED THAT THE EARTH IS FLAT!
Person 2: Guys look! the Modern Neanderthal discovered so called "Blinker Fluid Tank"!
by MyNameIsNotJay September 5, 2022
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When you fuck a redhead on her period.
This chick I banged last night was the worst Spiraling Neanderthal I have ever done!
by KaneKewl November 4, 2011
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The process by which an ofspring from a nice family becomes a jerk.
Joel's mom is so nice, but he's such a bigot. Must be a case of spontaneous neanderthalism.
by JavaJaneOhio August 12, 2010
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When you are having sexual encounters with an individual and you suddenly notice their ex's name is still tattooed on them you suddenly jizz on the name and use your dick to leave your mark
by Anne$pitz November 27, 2022
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