friend #2: "I don't know, probably stay here and diddle my skittle- wanna help?"
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...