Person typically has one button and it’s their way or nothing else. Don’t disagree with a know it all because if you do your entire day will change. They will quickly flip the script and could even lead to hate crimes, or even worse the “ K bye”
by Reneman May 31, 2018

A phrase used to describe someone who uses fancy and/or excessive speech. In the context of Limbus Company, the phrase was used in a scene where a character explains as if they read the thesaurus, causing one of the main characters to call them out.
Person A: I was struck with sorrow upon the sight of their entrails. In fact, I had gained an epiphany: why must the innocent bear death and mutilation for a root impertinent to them? Had the madmen been any wiser, the townsfolk would have not suffered this tragedy, and would live on to an untroubled life.
Person B: Yeah, we all know you read the thesaurus. So anyways, you saw those poor innocents’ corpses and you want us to take revenge? Y’know we’re not some heroes fighting for justice.
Person B: Yeah, we all know you read the thesaurus. So anyways, you saw those poor innocents’ corpses and you want us to take revenge? Y’know we’re not some heroes fighting for justice.
by yanyanyanyan4 August 15, 2025

Someone who thinks they’re the king of the mighty hill and acts like they’re in the right all the time, when 90% of the time a quick Google search will prove them wrong.
by Naterdave July 3, 2020

Governor So-Know-It-All was a general contractor in NH.
by Coop Dupe December 1, 2022

A know it all is someone who thinks they know everything, and refuses to take anyone else's opinion into consideration because, naturally, they know it all. Also known as a Brian.
I have green eyes but my boyfriend Brian insists that I have hazel eyes. Clearly he is a know it all.
by Arniverna September 9, 2022
