And the last time I didn't pop my trunk was probably at my church
But as soon as I left the parking lot, I maxed it out till it burst

from Big KRIT (Ft. Smoke DZA & Wiz Khalifa) – Only One Lyrics on Rap Genius

Meaning

When KRIT is at church he wants to be respectful and not have his trunk bumping with loud music. When he leaves the church he turns it up until his speakers pop.

Giving different people a different way to look at him, the “grown ups” see him as a respectful citizen going to church and believing in god the almighty, but in the hood he bump gangster shit in his lowrider.

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