An affliction of the oral cavity, that causes the infected person to continually talk about themselves.
Don't try talking to them. They have meosis so bad you will only get me me me in a speech about them or how good they are.
by Rich Muh January 10, 2014
Disgusted adult sitting on a park bench: Look at that spoiled-rotten kid on the playground! He's got the worst case of me-osis that I've ever seen!
by QuacksO August 14, 2018