What is the meaning of Outing?

A pleasure trip or excursion.

A performance in public, for example in a drama, film, on a musical album, as a sports contestant etc.

The act of publicly revealing that a person is homosexual or transgender without that person's consent.

The act of revealing somebody as having a certain secret, such as a being a secret agent or undercover detective.

present participle and gerund of out

Source: wiktionary.org