Top Definition
One who still hasn't joined the Facebook.
Pronunciation: As one word.
Amalgam of FB and neanderthal.
A: She posted the photos on Facebook.
B: You mean that new fad? I bet she'll send them around by email.
A: Email - that like gruntmail, already, and you, you are...well...(to himself) such an FBeanderthal!
by vivaeastafrica January 22, 2011

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