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"

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "fib":
   be untruthful, blague, bouncer, canard, cock-and-bull story,
   concoct, deceive, draw the longbow, equivocate, equivocation,
   evasiveness, exaggerate, exaggeration, fabricate, fairy tale,
   falsehood, falsify, falsity, farfetched story, farrago, fiction,
   fish story, flam, flimflam, ghost story, half-truth, legal fiction,
   lie, lie flatly, little white lie, make up, mendacity, mislead,
   palter, pious fiction, prevaricate, prevarication,
   slight stretching, speak falsely, story, stretch the truth, tale,
   tall story, tall tale, taradiddle, tell a lie, trump up,
   trumped-up story, untruth, untruthfulness, white lie, yarn



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

FIB
       Forwarding Information Base (router, LAN, Internet)


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