Question: What does FAB mean? They say it constantly.
Tailkinker
15th Nov 2004
Thunderbirds (2004)
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Answer: It means "message received and understood". It doesn't stand for anything; it was simply meant to sound vaguely hip.
Tailkinker ★
True. Gerry Anderson has said in interviews that it doesn't stand for anything. Fans have made up meanings including Fully Advised and Briefed or Finalise All Broadcasts but the person who posted above is right. It just sounds cool.