Trey is referring to this girl as being a gun, because usually when a guns loaded you cock it, but he’s meaning he’s gonna fuck her.
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First off, whoever posted these lyrics got them wrong, the correct lyrics are
“I fucked four bitches, I got eight balls,
I could finish your career nigga, 8 bars, ”
And it means French fucked 4 girls and has 8 balls, and could finish your career in 8 lines.