WordNet (r) 3.0 (2006):

flub
    n 1: an embarrassing mistake [syn: blunder, blooper,
         bloomer, bungle, pratfall, foul-up, fuckup,
         flub, botch, boner, boo-boo]
    v 1: make a mess of, destroy or ruin; "I botched the dinner and
         we had to eat out"; "the pianist screwed up the difficult
         passage in the second movement" [syn: botch, bodge,
         bumble, fumble, botch up, muff, blow, flub,
         screw up, ball up, spoil, muck up, bungle,
         fluff, bollix, bollix up, bollocks, bollocks up,
         bobble, mishandle, louse up, foul up, mess up,
         fuck up]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "flub":
   bad job, bevue, bitch, bitch up, blow, blunder, bobble, boggle,
   bollix, bonehead into it, bonehead play, boner, boo-boo, botch,
   bugger, bugger up, bungle, clumsy performance, drop a brick, error,
   etourderie, fluff, foozle, foul up, fumble, gaucherie, goof,
   goof up, gum up, hash, hash up, louse up, mess, mess up, miscue,
   mistake, muff, off day, sad work, screw up, slip, stumble, trip



The Free On-line Dictionary of Computing (30 December 2018):

FLUB

    The abstract machine for bootstrapping
   STAGE2.

   [Mentioned in Machine Oriented Higher Level Languages, W. van
   der Poel, N-H 1974, p. 271].

   (1995-03-13)