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British Dictionary definitions for f.a.b.

F.A.B.

interjection
  1. British an expression of agreement to, or acknowledgment of, a command
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Word Origin

C20: from British television series Thunderbirds
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012