F.A.N.B.
F. A. N. B. is when you're so tired of your old bitch you're willing to fight anyone for a new one.
He called his ex 'old bitch' and said 'F. A. N. B.!' at the club.
She texted me 'F. A. N. B.?' after I ignored her for a week.
My brother got into a fight at the gym because of F. A. N. B.