What is the meaning of Betty?

A short bar used by thieves to wrench doors open; a jimmy.

A picklock, skeleton key; a tool for opening locks.

A man who performs tasks that traditionally belong to a woman; an effeminate or gay man.

A pear-shaped bottle covered with straw, in which olive oil is sometimes brought from Italy; a Florence flask.

A baked dessert made with alternating layers of sweetened fruit and buttered bread crumbs.

An attractive woman; a babe.

To pick a lock, to open with a betty.

To be overly attentive to someone or something.

Source: wiktionary.org