noun

• (slang) A short bar used by thieves to wrench doors open; a jimmy.
  "No modern Lycæum vvill ever equal thy Glory, […] deſcribing the povverful Betty, or the artful Picklock, […]"
• (slang) A picklock, skeleton key; a tool for opening locks.
  "After a quick meal at a tea shop, we found ourselves in the hallway at the Midland Hotel, where he removed a skeleton key, or “betty” as he called it, from his pocket and inserted it in the keyhole. […] Once they were out of sight, I fumbled about with the betty for a few moments before the lock finally clicked open."
• (archaic, derogatory) A man who performs tasks that traditionally belong to a woman; (originally) an effeminate or gay man.
• (US, archaic) A pear-shaped bottle covered with straw, in which olive oil is sometimes brought from Italy; a Florence flask.
  "On olive oil in casks, twenty cents per gallon; olive salad oil in bottles or betties, thirty per centum ad valorem"

verb

• (archaic) To be overly attentive to someone or something.
  "“I’m perfectly well, thank you, Miss Hester,” she said, coldly. “I detest being bettied.”"

noun

• (slang, derogatory) A girl who hangs out with skateboarders or surfers.