diddle

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 which they are placed.

The penis.

Paul was the first one to unzip his pants, take out his diddle, and make himself ready to pee on the wire.

Gin (the drink).

[…] a long, wooden porch good for listening to coyotes and owls, with a glass of diddle at hand.

To cheat; to swindle.

'No one ever got rich being honest,' the father said. 'Customers are there to be diddled.'

To molest.

To masturbate.

To waste time.

To totter, like a child learning to walk; to daddle.

And, when his forward strength began to bloom, / To see him diddle up and down the Room!

A meaningless word used when singing a tune or indicating a rhythm.

What's that tune that goes "diddle di-dum, diddle di-dum, diddle di-dum-dum"?