Got it - that's what my grandma told me
And you've got to be a dumb dumb dumb motherfucker
Not to listen to what you hear from the OG's

from Big Sean – FFOE Lyrics on Rap Genius

Sean’s grandma has got to be pretty wise to live to that age in the D. An original gangsta, in his opinion. He plays with the acronym, obviously, as he could mean original grandma.

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