the person who stays at the stash house and watches the drugs. usually cocaine/crack.

A person who referees baseball games and enforces the rules; usually does not have a girlfriend because they are too busy fucking up games.

In Australian Football, the person who runs around the field blowing a whistle and tries to tell the players what to do. They are usually born without any form of eyesight. aka White Maggots

Umpire is a proper noun used to describe a member of Urban Umpires private hip hop organization.

The most current members (who must meet strict criteria and be voted in unanimously) include:

Organized Konfusion's Prince Po
Amad Jamal
Foreign Legion's Marc Stretch
Just Jay
Turbin (Cali Agents crew)
Grand The Visitor and The Architect (Homeless Derilex - 2nd ever Stonesthrow release and hailed by Peanut Butter Wolf)
Friz Bola & RasCue (Various Blends)
Mojo Swagger
Crush Delight
Coupe D'ville
Cold Showda