"diddling" in the verb sense
1. victimize, swindle, rook, goldbrick, nobble, diddle, bunco, defraud, scam, mulct, hornswoggle, short-change, con
deprive of by deceit
"He swindled me out of my inheritance"
"She defrauded the customers who trusted her"
2. toy, fiddle, diddle, play
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"
Source: WordNet® (An amazing lexical database of English)
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