Obsolete and humourous slang for sexual intercourse from the male 'point of view'. Examples:

  • "I diddled her silly behind the mangroves while the maidservants tittered."
  • "I crept up behind her as she was bent over poking the coals, lifted her apron, and diddled her."
The kind of thing only moustachioed gentlemen in tailcoats say to each other over cigars and brandy in a bad Victorian porn novel.