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AFB stands for "Away From Brain". A typically AFB person is a person who acts just plainly brainlessly..AFB at first derived from the expression "afk", but "afb" stood firstly for a person , who wasn't afk, but acted just as retardedly as if he/she would've been it. The AFB expression is used by 1337 speakers, who applies their 1337 speaking abilities to their everyday 1337'ish lifes.
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