1. Also, O.G. Philately. original gum: the gum on the back of a stamp when it is issued to the public.
2. Archit. ogee.
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O.G.,
an abbreviation for the following:
1. officer of the guard.
2. ogee (molding).
3. Olympic Games.
4. Also, o.g. Philately. original gum (a stamp in mint condition with the original mucilage).
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OG, O.G.contracted form of ogee.
Useful english dictionary. 2012.