Mentally deranged 

unable to behave and think normally, especially because of mental illness
mentally deranged
a deranged attacker
At first I thought he was deranged.
The plan seemed to be the product of a deranged mind.

You Mentally deranged i had your back.

Mentally deranged by ... Zjdbckdnznsjd December 1, 2019

Mentally Fish And Chips 

When Someone Is Ridiculously "Anti-Geeze" even though Sebastian And Tom Irvin Are Over As Fuck.

Liam is so "Anti-Geeze" he makes t-shirts out of bedsheets and pen. He's such a keyboard warrior. Mentally fish and chips.

Mentally Fish And Chips by The PNTRS June 9, 2015

Mentally Saitamatarded 

A Saitama fan with an extremely low IQ that thinks Saitama can solo all of fiction and downplays other verses to fit there bullshit narrative usually hates on dragon ball and tries to say Goku isn't even universal with zero proof whatsoever

Don't even bother debating him he's to mentally Saitamatarded to accept facts and logic

Mentally Saitamatarded by Lilith Nishikinomiya August 31, 2022

mentally frustrated 

When your brain won't shut the fuck up , just cause you want to sleep.

Can't sleep I'm mentally frustrated

mentally frustrated by Andy2009 September 21, 2016

Mentally drunk 

when you get so tired you sometimes cant think strait and you start being silly for no reason

someone: man your getting really mentally drunk!
someone2: i know, i think imma do something and put something on urban dictionary.

Mentally drunk by MYsterious zanacara July 31, 2018

Mentally mushy 

When that dude so fuckin stupid ya just gotta call them mentally mushy

Yo Charlie white man youre fucking mentally mushy

Mentally mushy by Virgin_Chilly_Dick January 27, 2020

Mentally weak

You are mentally weak if you cannot beat your PE teacher's 7 year old son in athletics

Mr Cullen: Run faster or I will mentally weak you!
Noah: Yo sir I'm already done
Mr Cullen: Well done kiddo your great but them over there are pretty slow
Them over there: Noooooo sir pleeeeasssee don't do it not the mentally weak laser aaaaahhhhhh
Mr Cullen: YOU ARE MENNNNNTALLLYYY WEEEEEAAAAAKKKK!!!!
Them over there: Nnnnnnnnooooooooooooo!

Mentally weak by DeviLs brOther May 4, 2021