"jack in" means: To connect a brain directly to a computer.. This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.
jack in
(science fiction, ambitransitive) To connect a brain directly to a computer.
Seen in the wild
8 citations · last seen May 2026
Seen in the wild
BlueskyMay 2026
I haven't either, but it's everywhere here, so I assume it's at McDonald's? Come to think of it, the last time I was forced into a Jack in the Box, they had nothing but a touch screen drink dispenser, so fake tea.…
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BlueskyMay 2026
the fact that Jack in the Box is a regional chain and not available to all is an affront to America’s heritage as a Christian nation
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BlueskyMay 2026
and 2 tacos for 75 cents at Jack in the Box 🌮🌮
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BlueskyMay 2026
my dad always wanted to get jack in the box for lunch when my mom was out of town specifically for the tacos and I never why but then in college I got j bo tacos stoned as hell late night and was like "oooooooh my god…
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BlueskyMay 2026
LA Food Deals — May 5, 2026 🍟 McDonald's — Free 6pc McNuggets w/ $2 min purchase (50% off) 🍔 Jack in the Box — Free Jumbo Jack w/ large drink purchase (33% off) 🥞 Norm's — Free Buttermilk Hotcakes (100% off) More…
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Definitions
UK
#1·Apr 27, 2026UK
(science fiction, ambitransitive) To connect a brain directly to a computer.
For parents
"jack in" means: To connect a brain directly to a computer.. This is a fairly neutral word with no inherent risk attached. There is no real cause for parental concern; it is descriptive vocabulary rather than something dangerous. If your child uses it, context will usually make the meaning clear. A brief, curious question about where they heard it is generally enough to know whether to follow up.
For ESL learners
"jack in" means: To connect a brain directly to a computer.. Register: neutral, standard English, usable in most everyday contexts. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.
Heard in the wild
“I haven't either, but it's everywhere here, so I assume it's at McDonald's? Come to think of it, the last time I was forced into a Jack in the Box, they had nothing but a touch screen drink dispenser, so fake tea. Dollars to doughnuts real tea is too much for Micky D's.”
— Bluesky· May 2026“the fact that Jack in the Box is a regional chain and not available to all is an affront to America’s heritage as a Christian nation”
— Bluesky· May 2026“my dad always wanted to get jack in the box for lunch when my mom was out of town specifically for the tacos and I never why but then in college I got j bo tacos stoned as hell late night and was like "oooooooh my god.... my dad was a stoner....”
— Bluesky· May 2026
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UK
#2·Apr 27, 2026UK
(transitive, idiomatic, British) To stop doing a regular activity, such as a job or studying.
I've had enough of working nights, so I'm going to jack in my job.
Cluster: work
Heard in the wild
“and 2 tacos for 75 cents at Jack in the Box 🌮🌮”
— Bluesky· May 2026“LA Food Deals — May 5, 2026 🍟 McDonald's — Free 6pc McNuggets w/ $2 min purchase (50% off) 🍔 Jack in the Box — Free Jumbo Jack w/ large drink purchase (33% off) 🥞 Norm's — Free Buttermilk Hotcakes (100% off) More deals at lahomewin.com”
— Bluesky· May 2026“Another wonderful Jack in the Green, thank you Hastings 🙂❤️”
— Bluesky· May 2026“Hmm. How much do I want to drive to a jack in the box today? 🤔”
— Bluesky· May 2026“Remake? 100% agree. PSX? Absolutely not. The best stalker character RE has ever done outside of maybe Jack in RE7.”
— Bluesky· May 2026
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UK
#3·Apr 27, 2026UK
(music recording, computing, electronics) To insert an electronic coupling into a receptacle; to connect to something, whether involving a physical medium or not.
I'm going to jack my job in.
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For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
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UK
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Other words near "jack in" (J)
jackedjacked upjackeenjacketjacketingjacket potatojack-in-the-box effectJack in the CrackJack-in-the-waterjack intoJackintoshjack it
Browse all slang words starting with J.