What is the meaning of Minx?

A flirtatious, impudent, or pert young woman.

A promiscuous woman; also, a mistress (the other woman in an extramarital relationship) or a prostitute.

A pet dog.

Used transitively when followed by it: to behave like a minx, that is, in a flirtatious and impudent manner.

To make (someone) like a minx; to become like a minx.

obsolete spelling of mink (any of various semi-aquatic, carnivorous mammals in the Mustelinae subfamily)..

Source: wiktionary.org