I think I'm sellin' a million first week, man I guess I'm a optimist

from Migos (Ft. Drake) – Versace Lyrics on Rap Genius

Meaning

An optimist is someone who always looks on the bright side and feels positive about forthcoming events.
Drake believes that his album will sell a million copies in its first week, but this is said tongue in cheek as he then suggests that maybe he’s being a bit too optimistic.

UPDATE: Nothing Was The Same sold 658,179 copies first week, optimistic indeed

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