Top Definition
An EmJim is someone who is more than a designated driver, they are a chaperone for drunken excursions. Often filled with despair about their task for the night, EmJims remain dedicated to their job. Their primary responsibility is to make sure that no one gets arrested or raped.
Creepy Old Guy: Wow! I wanna take that girl home!
Creeper McCreepersons: Lost cause man. She's got an EmJim.
by HereComesJohnny January 02, 2010
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