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It Is an abbreviation which means "fuck you, little bitch".
person a: "ur so annoying!!"

person b: "fylb."
fylb by stxrz! September 13, 2025
Related Words
fylb FYLBAF FYLBB
An acronym for "Fuck You Little Bitch Ass Faggot".
Man 1: FYLBAF, Joey!
Joey: Fuck you little bitch ass faggot too!
FYLBAF by IcyAero January 1, 2018