"to cheat, swindle," 1806, from dialectal duddle, diddle "to totter" (1630s). Meaning "waste time" is recorded from 1825. Meaning "to have sex with" is from 187 [..]

swindle

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 s [..]

Verb. 1. To have sex with, and often used with reference to masturbation of the female genitals. 2. To swindle. {Informal}

(v) deprive of by deceit(v) manipulate manually or in one's mind or imagination

To cheat in a small way, as “I diddled him out of … .” Edgar Allan Poe has an article on the art of “Diddling.” Rhyming slang is very common. (See CHIVY.) [..]

make traditional 'mouth music'.

(music) In percussion, two consecutive notes played by the same hand (either RR or LL), similar to the drag, except that by convention diddles are played the same speed as the context in whic [..]

http://groups.google.com/group/aus.sport.rugby-league/msg/df3fbaca61c39f6b, "Question for Mango and the Green man", April 1 2007, ''He didn't take his diddle out and play with it in front of the cro [..]

To fondle or finger.