A slang term for ecstacy pills. Can also be used to describe the state of mind of a person who's high on pills('Diddled'). Any arrangements on this is acceptable, e.g 'diddly-doo', 'dids', 'diddlered'.
Mark : 'How're those diddles doing for ya?'
James: 'Man, i'm fucking diddled of my face man. Could do with another diddly-doo though if you've got one?'
Mark: 'Sorry bro, all out of dids, you sank them all you diddly twat'