F.A.B.

interjection

British an expression of agreement to, or acknowledgment of, a command

Word Origin for F.A.B.

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