"Brian Tumor" (noun): A highly contagious and profoundly debilitating condition primarily affecting pre-adolescent males named Brian, typically observed at age 12. The disease manifests as an uncontrollable expansion of ego and a dramatic increase in the frequency of unsolicited, poorly timed, and often cringe-worthy attempts at humor. Symptoms include a marked decline in tolerance for other people’s well-being, an overwhelming need to insert oneself into every conversation, and an alarming tendency to dominate social situations with an incessant stream of 'inappropriate' jokes.When you're stuck in a group chat with a 12-year-old named Brian, and he won't stop making terrible puns, interrupting every conversation, and somehow turning everything into his personal highlight reel. It's like his brain is a tumor, growing uncontrollably, with zero regard for anyone else's sanity
Bro, I can't take it anymore. Every time Brian speaks, it's like a Brian tumor of bad jokes and unsolicited opinions. Someone please save us.
by sawcon May 14, 2025
Get the Brian Tumormug. A guy who plays valorant with yolor3stis and Tetoris and has taken the istanbul servers by storm with his big brain plays on the agent Omen.
by Ilel kalliakmeme October 26, 2020
Get the Big Brian Ilelmug. A himbo with a heart of gold.
by big fat juice November 22, 2021
Get the Brianmug. Brian Jeon is a man. A man of pure beauty. A man of massive elephant cock. A man of non-stinky toenail clippings. When I make love to him, his juicy cock throbs against my belly button. Shi turn me on hella ngl. Not only that, but when he bends over and takes it in the ass, his juicy booty be bouncing hella. Bro might have a BBL ngl but I can't tell. The only downside is that he sometimes has the occasional dingleberry stuck between his cheeks, but it looks like mini M&M's so I be munching my dessert. Brian Jeon. Sexually assault me.
by Brian_Jeon's_Lover_69_XO_8==D~ December 3, 2024
Get the brian jeonmug. 
A person who is a dirty monkey and deserves to kill themselves after what they have done. Or it can used as of a way to say that you are a gay, black, dirty, weeiner lickin, monkey no kizzy
by Frostyweeny November 13, 2022
Get the Brianmug. A sensitive boy who likes watching movies in the dark. Gets angry at games and gets very upset sometimes.
by Yoyotitoturieud December 21, 2019
Get the Brianmug.