You know I'm a real OG and baby I ain't from the T.O

from Maejor Ali (Ft. Juicy J & Justin Bieber) – Lolly Lyrics on Rap Genius

Meaning

In contradiction with popular believe, Justin is actually not from the well-known city Toronto, Ontario (T.O.) but was born in London, Ontario and originates from Stratford, Ontario.

OG is a term used to describe an Original Gangster, someone who has been a true hustler for ages and knows the deal.

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