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When a guy says some outworldly primal shit that can only be construed as an act of machismo.
This guy was telling me of how it's his dream to die in WW3. What kind of boy brain shit is that?
Boy brain by Mattricide June 12, 2019
When a guy exhibits behaviors of a young boy whose frontal lobe has not developed even though they are at the age where it should be developed.
He has major boy brain. Why did he not think before he said something so stupid?
boy brain by potatoglassnoodle April 19, 2024

Big Boy Brain Smart 

joe is the big boy brain smart of us all

boy...brainr0t 

"Oh yeah you know Boy...brainr0t? He is gender envy"
boy...brainr0t by Heathly >3 February 3, 2021

brainless pretty boy 

Someone who kisses himself in the mirror
He wishes everyone was as pretty as him, so he kisses the mirror to feel special and loved. That dude is a brainless pretty boy