The same thing happened eon’s ago

from B.o.B – The Watchers Lyrics on Rap Genius

Meaning

It’s a reference to the lost civilization of Atlantis, the people of Atlantis are refered to as “The Watchers” they were the guardians from all things evil keeping them where they belong and such.
If you watch the video, you’ll see a picture of Atlantas. That means we’ll suffer the same fate as them. Either that or he’s just talking about the NWO’s rise.

B.o.B. likes to reference eons. In 5th dimension, he says

I’m eons and eons beyond these beings.

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