Definitions by Scotty T.

gear down 

A term used for a person who suffers from the mental disorder known as egoistic-ism. Also known as a person who obseses about themselves and needs to be put in their place.

Bob: "Woah, dude she won't shut up, she keeps going on and on about that dude"
Bill: "Actually? she needs to gear down.

gear down by Scotty T. May 6, 2011