(noun) the tendency to be generally rude, vulgar, immature, stupid, assuming, a band Wagoner, use ad hominem and insulting to people online or in person, especially in an argument or disagreement(like the average middle schooler)
A: "Cry about it🥰🤪 you prolly never felt a woman's touch."
B: "bro u got middle school mentality I'm done."
B: "bro u got middle school mentality I'm done."
by bthe1 April 12, 2021
A person who is in high school, that has the mindset of a middle schooler. Meaning: they constantly cause drama, don’t take responsibility for their actions, they are hypocritical, and they expect other people to clean up their messes.
Person 1: Have you seen the newest episode of “Keeping Up with the Kardashians?”
Person 2: Yeah, they seriously have such a Middle School Mentality.
Person 2: Yeah, they seriously have such a Middle School Mentality.
by Ur mom fr🤘 December 26, 2023