<jargon> (US) To work in a casual manner, or the result of such work. (In the UK "to diddle someone" means to cheat them).
"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."
Similar to twiddle, less purposeful than tweak.
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Nearby terms: Dictionary of Algorithms and Data Structures « Dictionary of Computing « DID « diddle » Didot point » die » die horribly