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 10, 2022
Someone who goes around thinking things are big and clever, and believe they know it all about everything, but don’t because their still things he / she don’t know about just yet.
by Urbantheturban July 08, 2019
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 April 27, 2018
A lot of people confused the guy with a know it all. He didnt think he had all the answers to everything, but he was sure of which ones were bullshit.
by Solid Mantis June 10, 2020
by Abcvd January 04, 2024
by ChanceD May 07, 2021
When you are legitimately trying to get a full night of sleep but you are unable to fall asleep, so you end up staying up all night. May be by choice after waiting too long to get to sleep, or by trying all night to get to sleep and not succeeding. Usually catastrophic when you have an important event or task the following day.
by Nas2play February 02, 2018