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1.
A person who buys everything without thinking about it, or because she/he simply needs to buy something to be happy.

A company's best friend
Consumerzombie: "I am a big fan of DLC for games, these are awesome! I bought every single DLC to date, because these make games great"

Smart Person: "Damn you are a consumer-zombie, buying this cheap crap without thinking. DLCs are just the new way to milk money from dumb people like you.."
by Consumer-zombie January 20, 2010