Loosing your self confidence,motivation after a serious of unfortunate events and treating yourself badly until commiting rage quit from life.
My gf broke up with me, my collage broke up with me, my friend broke up with me. I feel like I am in mental doom
by Azagth February 23, 2020
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To act younger than your age

To be childish

To have the brain of a fetus

To make decisions that a fetus would make
That bitch got fetus mentality
by Lil Mouthy May 11, 2020
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If you ask someone who's climbed a big mountain why they did it they will likely say:
"Because it's there"
This is the mountaineer mentality. They had no good reason to do it, but they did it anyway.
Person 1: Hey, why the hell did you sleep with my sister?!?
Person 2: Because I can.
Person 1: That's some whack ass mountaineer mentality you got there bucko *proceeds to beat the shit out of Person 2*
by Dick334289 November 24, 2022
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Someone who developed non deserved confidence purely as a self defense mechanism.
That mf has "meatball mentality" leave him alone to figure that out
by Custard420 October 22, 2022
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