Plus I know ol' girl a freak
And how she singin' a solo

from Lecrae – Church Clothes Lyrics on Rap Genius

the narrator is implying that the girl singing in the choir is having sex outside the context of marriage, but is playing this innocent girl singing the solo at church. The narrator thinks she is two faced. J. Cole talks about this same idea of the church girl being a freak in bed in his song Purple Rain

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