Mentalcourse 

The act of mentally picturing oneself having sex with another person. Common among men.

"Hey look at her!"
"Dang man, she'll make for good mentalcourse later"

Mentalcourse by hey its A September 24, 2008

Mentallectual

Someone who is really intelligent, but doesn't have their head on straight. They have a thirst for knowledge and could've done anything with their life, but ended up doing nothing. They can chat politics or philosophies all night long over a beer, but aren't motivated to apply their knowledge toward a career. They are insanely smart in weird ways and know crazy amounts of trivia. You always want them on your team in board games. In the game of life they are self-sabotaging.

He's like Matt Damon in Good Will Hunting: the smartest guy I've ever known, yet he's a janitor. He's a mentallectual.

Mentallectual by AesonRhymer September 14, 2010

mentalsheep 

Someone who is incredibly awesome, but highly addicted to Nandos.

We already had Nandos 50 times this week, you're such a mentalsheep.

mentalsheep by jfdklae June 13, 2017

mentalvention 

A meeting with 3-5 mutual friends who have been through the 💩with you.

Mentalvention occurs when somebody you all know, says something to you that is ‘SOOO’ out there, that you have to call your posse to say,”WTF is up with Steve?”

Dave realized that Steve had said something that was way out of character for him, and he decided a Mentalvention was an effective way to resolve the issue.

mentalvention by JD Bopuroptop June 27, 2021

Juggernaut Mentality

Thinking that you can take on more than you actually can.

"I ran into 5 guys, I had the "Juggernaut Mentality" thinking i could take them all on at once and got my ass kicked" Your not the Juggernaut, bitch.

Juggernaut Mentality by laggin July 13, 2010

icicle mentality

To retain a thought-process in accordance with one’s own personal agenda; to not give a flying fuck about anyone else. This usually comes with an air of arrogance, and (sometimes) slight douchebaggery .

Example one:
Matt: That kid is a prick

Derek: He got that icicle mentality.

Example two:

Alex: you seem unfazed by their insults, but how?
Brett: it’s icicle mentality.

icicle mentality by Achilles De Flandre June 8, 2018

Cob mentality 

American government policies of heavily subsidizing corn production

Cob mentality of the government leads to corn availability at prices lower than production cost. The food industry likes to use this cheap, high fructose corn syrup in all processed foods increasing chronic disease burden.

Cob mentality by Jumbled McGobbledygook December 14, 2020