FIB Meaning of FIB in English n. & v. --n. a trivial or venial lie. --v.intr. (fibbed, fibbing) tell a fib. Derivatives: fibber n. fibster n. Etymology: perh. f. obs. fible-fable nonsense, redupl. of FABLE Oxford English vocab. Оксфордский английский словарь. 2012