UFOs don't make any noise
When they travel in hyper speed, so welcome aboard

from B.o.B (Ft. Morgan Freeman) – Bombs Away Lyrics on Rap Genius

Meaning

This goes with the concept of Strange Clouds, and B.o.B has always referred to himself as an alien.

Also UFO’s may be referring the unknown group he mentioned earlier. He’s saying there progressing fast and unnoticeable. So join him in this battle

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