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A wild celebration. It means Fucking Bitches in the Ass. Everyone's happy and loud.
At the party, the DJ said 'Let's get some F'n B's in the A!' and the whole room went crazy.
My cousin texted me 'We're having F'n B's in the A tonight. Bring the beer.'
He screamed 'F'n B's in the A!' when he saw his ex at the bar.