How is “gear up” used?

In The Social Network (2010), one line is: “And look, I wanna see everyone here geared up for a party.”

Which movie is “gear up” from?

The clip at the top of this page is from The Social Network (2010).

to prepare yourself / sb / sth to do sth

Heard in 7 movies

Oxford100% of films
to prepare yourself / sb / sth to do sth
- Hitting Overtown now. - Gear up.
You heard him. Gear up.

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

And look, I wanna see everyone here geared up for a party.

Said in 8 films · #1