See o.g.(def 1).
Words nearby original gum
Definition for original gum (2 of 2)
Also O.G. Philately. original gum: the gum on the back of a stamp when it is issued to the public.
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British Dictionary definitions for original gum
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