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When someone outwits you in a subject that you feel you know more about, then totally trashes all of what you said concerning the subject.
Brother A: dude... you can't "send" people ringtones from one phone to another, only way to do that is to either download them, buy them from a ringtone store thingy online, itunes, or put mp3 clips onto your phones memory card...

Brother B: Or go to Myxer.com and get them for free... And yes, you can send them. lol I did it all the time before my phone got shut off.

Brother A: hmm, well, that sounds gay, go to hell, you weren't supposed to uppermind me like that
Uppermind by Slayer8907 October 19, 2010
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Undermindtm 

A clothing and accessory company started by Matthew Vargas in Morgan Hill, CA. Established in 2004, the company makes a wide range of products marketed mainly to the LGBT community.
Guy 1: That's a cute shirt man.

Guy 2: Thanks, I got it from Undermindtm, bro.

Guy 1: Let's make out.
Undermindtm by NickFirato October 19, 2011
A measure at any given time of who likes who more in a relationship. The person with the upperhand is allowed to make decisions for the couple, to slack off doing chores, to get more sexual favors, etc.
After Yewande wrote her love poem she's definitely lost the upperhand! Too bad for her, poor little tall girl...
upperhand by gozimbo April 5, 2019

underminded

A person with less knowledge who attempts to appear more intelligent by providing a solution that has already been established with the intent to take credit.
Jacob flagged down his supervisor to discuss a problem and solution that he had overheard his coworker Cece describing. He regurgitated the situation which left Cece feeling completely underminded as she knew all the intricacies and Jacob had clearly taken credit for her solution.
underminded by puppy1002 February 25, 2015

Upperman High School 

Located in Baxter, TN, this school is where all the dope ass redneck stoners and dumb, funny football players go to get an “education” but is absolutely ten times better than the neighboring school Cookeville High School.
There’s been an influx of cat girls coming into Upperman High School, they like to hiss at me.
Upperman High School by Fuzzball September 1, 2021
Noun (plural Underminds)

(underminded, underminding, underminder)

To Think, Spy, Eavesdrop, Outwit, and Prank on your enemies.
Kevin did Underminded his Arch-Rivals Harry and Marv.
Undermind by MikeKal July 26, 2009