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An overly confident dude with a Science, Technology, Engineering and Mathematics (STEM) degree.

Whilst the STEM bro is well-versed in all matters related to investment and performance nutrition, his understanding of all things politics, sociology, arts and culture is sorely lacking. A STEM bro's views on society are often a mere and never-to-be-questioned reflection of his privilege, which he is naturally unaware of.

His confidence carries out to all possible conversation topics, even those he knows nothing about. He is also prone to making obnoxious references to his earning potential.
This guy just wouldn't hear it when I told him his cringy fetish for a particular racial type women was socially contructed and rooted in colonial stereotypes. He was just such a STEM bro.

Marcia's new boyfriend is cute and all, but he's kind of a STEM bro so don't expect riveting conversation about Roe Vs Wade.
STEM bro by egggn May 19, 2023
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Stembrosfs 

To fall over in a polite manner.

Silent f.
The bride fell over at the alter, therefore all the brides maids stembrosfs'd.
Stembrosfs by Hands_olo October 27, 2010
A stembro is a student (usually in high school or undergrad) that excels in STEM courses and goes out of their way to make sure others are aware of it. They also often put down/shame others who are struggling in their courses or those in lower level coursework. They are often narcissistic and insecure.
"John is such a stembro, he told Billy he wasn't intellectually fit for the math major after he got a C on his linear algebra exam."
stembro by randomSloth08 September 9, 2022
Jake is taking three math classes back to back (AP STATS, AP CALC BC, and MULTIVARIABLE CALCULUS). He’s such a freaking stembro.
STEMBRO by georgewashington January 27, 2022