Yeah, so here I go, B.o.B, Bobby Ray, I don't know, need I know
But I know, that I flow, rack 'em up, knock 'em down, dominoes

from B.o.B – Don't Let Me Fall Lyrics on Rap Genius

Meaning

Born Bobby Ray Simmons, Jr., he goes by different aliases such as B.o.B or Bobby Ray

He has so many different names he doesn’t know all of them, all he know is that he can rap well and can knock other rappers down like dominoes

To help improve the meaning of these lyrics, visit “Don't Let Me Fall” by B.o.B Lyrics and leave a comment on the lyrics box