[1] : The Collaborative International Dictionary of English v.0.48

diddle \did"dle\, v. i. cf. daddle.
   to totter, as a child in walking. obs. --quarles.
   1913 webster
see also:
daddle 

[2] : The Collaborative International Dictionary of English v.0.48

diddle \did"dle\, v. t. perh. from as. dyderian to deceive, the
   letter r being changed to l.
   to cheat or overreach. colloq. --beaconsfield.
   1913 webster

[3] : WordNet (r) 2.0

diddle
     v 1: deprive of by deceit; "he swindled me out of my
          inheritance"; "she defrauded the customers who trusted
          her"; "the cashier gypped me when he gave me too little
          change" syn: victimize, swindle, rook, goldbrick,
           nobble, bunco, defraud, scam, mulct, gyp, con
     2: manipulate manually or in one's mind or imagination; "she
        played nervously with her wedding ring"; "don't fiddle
        with the screws"; "he played with the idea of running for
        the senate" syn: toy, fiddle, play
see also:
victimize swindle rook goldbrick nobble bunco 
defraud scam mulct gyp con 
toy fiddle play 

[4] : Moby Thesaurus II by Grady Ward, 1.0

135 moby thesaurus words for "diddle":
   ball, bamboozle, be intimate, beat, beguile, beguile of,
   beguile the time, betray, bilk, bluff, bunco, burn, burn daylight,
   cajole, cheat, cheat on, chisel, chouse, chouse out of, circumvent,
   cog, cog the dice, cohabit, come together, commit adultery, con,
   conjure, consume time, copulate, couple, cover, cozen, crib,
   dabble, dally, dawdle, deceive, defraud, delude, dillydally, do,
   do in, do out of, doodle, double-cross, drone, dupe, euchre,
   finagle, flam, fleece, flimflam, fob, footle, forestall, fornicate,
   fribble, frig, fritter away time, fudge, gammon, get around, gouge,
   gull, gyp, have, have sex, have sexual relations, hoax, hocus,
   hocus-pocus, hornswaggle, humbug, juggle, kill time, lag, lallygag,
   lay, laze, let down, lie with, linger, loaf, loiter, loll,
   lollygag, lose time, lounge, make it with, make love, make out,
   mate, mock, mount, mulct, outmaneuver, outreach, outsmart, outwit,
   overreach, pack the deal, pass the time, piddle, pigeon,
   play one false, poke, potter, practice fraud upon,
   put something over, putter, rook, scam, screw, sell gold bricks,
   serve, service, shave, shortchange, sleep with, snow,
   stack the cards, stick, sting, string along, swindle, take,
   take a dive, take in, thimblerig, throw a fight, trick, trifle,
   two-time, victimize, waste time

[5] : Jargon File (4.3.1, 29 Jun 2001)

diddle 1. vt. to work with or modify in a not-particularly-serious
   manner. "i diddled a copy of advent so it didn't double-space all the
   time." "let's diddle this piece of code and see if the problem goes
   away." see tweak and twiddle. 2. n. the action or result of
   diddling. see also tweak, twiddle, frob.


see also:
advent tweak twiddle frob 

[6] : The Free On-line Dictionary of Computing (27 SEP 03)

diddle
     
        1. to work with or modify in a not particularly serious
        manner.  "i diddled a copy of advent so it didn't
        double-space all the time."  "let's diddle this piece of code
        and see if the problem goes away."
     
        see tweak and twiddle.
     
        2. the action or result of diddling.
     
        see also tweak, twiddle, frob.
     
        jargon file
     
        1995-01-31
     
     
see also:
advent tweak twiddle frob jargon file 

Diddle >> D Words
Diddle, definition of term: Diddle
diddle_pag1.html