Sneak peek

[Britney]

a sneak peek is just a small clip of a movie that is released before the movie as a sort of teaser for audiences.

[Mark Zuckerberg]

n.

A preview, especially of something not yet public; an opportunity to see select portions before it is officially available.

Not to be confused with [Sneak preview]

[Sarah]

Secretly watching porn in a friends house with other people present, but unaware.

[Jessica]

A marketing strategy that attracts customers, where a female bends over exposing more skin.

[Hina Muqadas]

an opportunity to see something before it is officially available: