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When was it first used and in what context?

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Tom Corbett, Space Cadet –  John Lawler Jul 2 '13 at 22:09
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@John: Exactly my first thought! Well, not specifically Tom Corbett, but it certainly looks to me like the kind of "future slang" you got in sci-fi from people like Robert Heinlein and Isaac Asimov many decades ago. Apparently we are now actually in that future, but it already sounds horribly "dated" to me. –  FumbleFingers Jul 2 '13 at 22:16
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The future is always disappointing when it arrives. –  John Lawler Jul 2 '13 at 22:23
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@JohnLawler “The future is already here — it’s just not very evenly distributed.” ——William Gibson –  tchrist Jul 2 '13 at 22:32
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Welcome Katelyn! What does your research show? Please provide it in your question so the community can benefit from it and not repeat what you've already done. :-) –  Kristina Lopez Jul 2 '13 at 22:38

3 Answers 3

The OED says the phrase "cool your jets", meaning to calm down or become less agitated, is originally US and the first quoted in a newspaper:

1973 Daily Tribune (Wisconsin Rapids) 29 Jan. 1/1 If you want to cool your jets, just step outside, where it will be about 10 degrees under cloudy skies.

That use is to literally cool yourself down. The first with the usual meaning is a bit later the same year:

1973 Independent Rec. (Helena, Montana) 21 Oct. 4/3 Nixon may be able to stifle Congress but he better cool his jets if he thinks he can mess with the rest of the world.

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Most certainly the Daily Tribune reference was to the slang term and was used in a sort of reverse metaphorical sense. –  Hot Licks Jan 23 at 18:20

Like the OED (which Hugo cites in his answer), J. E. Lighter, Random House Dictionary of American Slang, volume 1 (1994) gives a first occurrence date of 1973 for "cool [one's] jets":

cool (one's) jets to take it easy; become less less agitated or excited.

[Examples:] 1973 Eble Campus Slang (Nov.) 1: Cool your jets—settle down and relax: Cool your jets or the cops will still think you're the guilty one. 1978 UTSQ Get off my case, cool your jets, take a hike. 1980–89 Cheshire Home Boy 310: Martinez ... bops him one ... Cruise cools his jets. 1989 Dream Street (NBC-TV): Cool your jets, man. He's my brother.

But a Google Books search finds an instance of "cool your jets" from 1970. From William Walter Scott, Hurt, Baby, Hurt (Ann Arbor, Michigan: New Ghetto Press, 1970): [combined snippets]:

If you're getting bored like hell, the feeling's mutual, but just cool your jets and wait for a while. I've sorta got to talk about the conflict between me and my old man.

Like during this time there were lots of undercurrents that forced me to put my foot down and say the hell with what other people say. I've got to start thinking for myself. That was the gist of it.

Hathi Trust confirms the book's publication date and notes that "cool your jets" appears on page 53 of Hurt, Baby, Hurt, but it declines to reproduce its content, owing to copyright restrictions.

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I thought it might be a military term like for pilots or maybe its meaning is it's so cold you can cancel a jet engine heat, like the afterburner on a fighter plane

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Can you provide a citation? Otherwise, this seems like idle speculation. –  choster Dec 12 '13 at 15:42

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