The kind of people (both male and female), who instinctively only care about breeding with a cute/attractive counterpart. They are usually not very well educated and spend their time in bars scouting for potential victims of their blissful ignorance on using others.
"Dude, check out that guy jumping through that group of fine girls..."
"Yeah mate! She's a total neo-neanderthal!"
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
I gave her the neanderthal mark.
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.
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"!
Rubbing your eyebrows together while grunting.
She's cute and all, but then she gave me neanderthal kisses.
When you fuck a redhead on her period.
This chick I banged last night was the worst Spiraling Neanderthal I have ever done!