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Fuck all of you and your ugly mums. It comes from a movie called Fear of The Black Hat. It's the title of a book written by Ice Cold, who raps with a gang called Niggers With Hats.
F. Y. O. M! You're all trash and your mums are even worse.
F. Y. O. M! I'm gonna beat you up and your mums too.
F. Y. O. M! You're all weak and your mums are loud.