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original gum

noun Philately.
  1. See o.g.(def 1).
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o.g.

  1. Also O.G. Philately. original gum: the gum on the back of a stamp when it is issued to the public.
  2. Architecture. ogee.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for original gum

o.g.

abbreviation for
  1. own goal
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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