someone with a huge damn forehead that overhangs like a balcony. short for cro-magnon man.
that magnon is the missing link between apes and humans.
by Doobie March 23, 2004
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derivation of the term crow magnon or cro-mag, which is one who bares a resemblence to primative man. A Bro magnon is colloquily used to connote a jock. in popular culture. A bro magnon is usually defined by a desire to gain acceptance among his peers. The Bro Magnon or "Bro-mag" usually "gets all of the girls," which usually means mindless skanks. Bro magnons often engage in gang style rituals to gain status and power withen the tribe.
Look at that pack of Bro magnons, look at those whores on their arms. I bet they don't have a combined I.Q. of 30.

Bro magnons? i hate those knuckle-dragging morons.
by NotoriousBUD June 1, 2006
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When your buddy has become so drunk, he's de-evolutioned.
Hey man, you'd better stop, your pretty much a bro-magnon.
by Jay_H February 9, 2007
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A person who has no eyebrows, a huge forehead and is very unpopular. Claims to have alot of friends but only has their family as friends. A person who is very annoying and you have to slap them on the forehead constantly.
Midgets, cro-magnon
by MUSGROVE October 1, 2009
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Early species of undeveloped man, it has tendencies to sniff when it feels a sense of accomplishment, not to be mistaken for somebody of jewish descent.
His behaviour was similar to that of a cro-magnon
by Kran dillan December 21, 2019
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A recent generation of 20-40 year old white males that believe in caveman ideology cro-magnon. They espouse things that they attribute to being "manly" and denounce all other beliefs as weak or un-American. Many believe in conspiracy theories Holocaust/Sandy Hook deniers and outdated beliefs disproved by science flat Earthers.
Matt Gaetz wants to force people to stand for the anthem or face fines? He's such a bro-magnon.
by GDub20 June 14, 2020
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A proud card carrying , resolute , dyed in the wool ,alt right conservative republican asshole too stupid to know he’s an asshole.
Has anybody told that Jim Crow Magnon asshole that he’s President now?
by Uncle Baddie July 17, 2019
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