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1 definition by WebmasterProfessional3000

siefer

"Siefer" is a type of malware, usually found on MacBook Pro.
It slows down internet connections and writes its own name on websites.

Creepy weirdo.

Shit, I just got a Siefer on my Mac.

by WebmasterProfessional3000 November 13, 2014

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