Derriving from the Latin word Yoooo! and Coo-koo!.
A bird call from one homie to another.
Jimmy is standing outside of Ken's apartment building.
Jimmy: Yerrrrr!
Ken acknowledges Jimmy's arrival and responds: Yerrrr!
Jimmy is now aware that Ken will be right out.
Suppose you wanna nextel chirp yo lil homie right quick u jus say "yerr" and then they respond or u see yo friend on tha other side of the mall u jus say "yerr" really loud and you'll be sure to get a responce
Originated by the Mount Saint Vincent mens lacrosse team.
Can mean any type of greeting. Normally yelled at the top of your lungs so your boys can hear it across campus.