Good God, if I go this hard, by the time I'm ninety
I won't need viagra naw,

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

Meaning

ninety year old men can’t get hard(as in their dick), but he’ll go so hard that he won’t need viagra (a popular drug that gives you erections)

To help improve the meaning of these lyrics, visit “Bombs Away” by B.o.B (Ft. Morgan Freeman) Lyrics and leave a comment on the lyrics box