dmub 

You just misspelled dumb? Who's dumb now?

Two friends chatting online
Joe: dude u can't even spell you're so dmub
Yuri: HAHHAHA YOU JUST MISSPELLED DUMB YOU RETARD

dmub by glubglubglub420 May 22, 2020

Dmub 

Out of your mind

Somic are you dmub?

Dmub by skith November 29, 2021