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).

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

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to prepare yourself / sb / sth to do sth

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to prepare yourself / sb / sth to do sth
- Hitting Overtown now. - Gear up.

定義：Oxford Advanced Learner's Dictionary 第 9 版