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S.O.B.

or SOB

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(sometimes lowercase) Slang.
  1. son of a bitch.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for s.o.b.

s.o.b.

abbreviation for
  1. son of a bitch
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