And one on the scope, so if they frontin' I can sleep 'em

from Childish Gambino (Ft. Bun B) – R.I.P. Lyrics on Rap Genius

Meaning

Bun-B won’t put up with anyone who fakes friendship in order to engineer a position from which they can do him harm — and he keeps his rifle ready just in case he needs to take someone out

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