2. Female masturbation.
3. To cheat or swindle.
4. To ram a bottle up your own, or someone else's arse.
2. I caught her diddling in the broom cupboard!
3. He diddled me out of that job.
As you can see, confsuing the various meanings of the word will result in a big mess...
2. A word commonly used instead sex.
3. A word used to describe a lack of activity.
4. A word used to describe someone being defeated in any manner.
2. "Fuck me, i'd love to diddle Susan tonight."
3. The boys diddled about instead of going to class.
4. "Dude, i hear you got diddled in Tae-kwon-do on Saturday!"