Which movie is “keep under your hat” from?

The clip at the top of this page is from Slacker (1990).

Keep it under your hat. The people they need, like scientists. You heard about that?

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keep under your hat

In Slacker (1990), one line is: “Keep it under your hat. The people they need, like scientists. You heard about that?”

to keep sth secret and not tell anyone else

くだけた · 3 本の映画に登場

オックスフォード映画の 100%
to keep sth secret and not tell anyone else
But, uh, keep it under your hat, hmm?
Listen, uh, keep this under your hat, will you?

定義：Oxford Advanced Learner's Dictionary 第 9 版