The Collaborative International Dictionary of English v.0.48:

Fib \Fib\, n. [Prob. fr. fable; cf. Prov. E. fibble-fabble
   nonsense.]
   A falsehood; a lie; -- used euphemistically.
   [1913 Webster]

         They are very serious; they don't tell fibs. --H.
                                                  James.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fib \Fib\, v. i. [imp. & p. p. Fibbed; p. pr. & vb. n.
   Fibbing.]
   To speak falsely. [Colloq.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Fib \Fib\, v. t.
   To tell a fib to. [R.] --De Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fib
    n 1: a trivial lie; "he told a fib about eating his spinach";
         "how can I stop my child from telling stories?" [syn:
         fib, story, tale, tarradiddle, taradiddle]
    v 1: tell a relatively insignificant lie; "Fibbing is not
         acceptable, even if you don't call it lying"

The Devil's Dictionary (1881-1906):

FIB, n.  A lie that has not cut its teeth.  An habitual liar's nearest
approach to truth:  the perigee of his eccentric orbit.

    When David said:  "All men are liars," Dave,
        Himself a liar, fibbed like any thief.
        Perhaps he thought to weaken disbelief
    By proof that even himself was not a slave
    To Truth; though I suspect the aged knave
        Had been of all her servitors the chief
        Had he but known a fig's reluctant leaf
    Is more than e'er she wore on land or wave.
    No, David served not Naked Truth when he
        Struck that sledge-hammer blow at all his race;
            Nor did he hit the nail upon the head:
    For reason shows that it could never be,
        And the facts contradict him to his face.
            Men are not liars all, for some are dead.
                                                        Bartle Quinker