In this film clip one of the characters says "I'm jacked... I'm jacked to the tits!!!" - what does this mean in this context and other contexts?

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    It means excited, full of energy, ready to do something; same as "jacked up." It can be completely natural (an adrenaline rush) or drug-fueled. – Mark Hubbard Dec 16 '16 at 16:25

In this context "jacked" is a slang term similar to "high", meaning "under the influence of a powerful (usually illegal) drug. If I had to guess at its origin, I imagine it's a picturesque metaphor of your body plugged into an electrical socket, and therefore "full of energy" or "lit up". So it's most often used to refer to the use of drugs that make you feel especially powerful or energetic (like cocaine or perhaps steroids).

"Jacked to the tits," is a colorful metaphor that simply means "very high". In this film clip I don't know if the character is actually under the influence of a drug, but he feels as if he is high -- he's almost uncontrollably excited.

You should be careful not to confuse this with other slang terms that use "jacked". In some dialects, "jacked" or "jacked up" means "to have some injury or incapacity". For example, I could say something like:

I woke up this morning and my neck was jacked up (my neck hurts). I must have slept weird.

She ran her car off of the road and her body was jacked for months after.

Of course, you can use both, for fun:

He was totally jacked last night but after he came down he was jacked up all the next day.

There are other slang uses of "jacked". In some contexts it can mean "stolen" (as an abbreviation of "hijacked"):

Dude! My car got jacked last night!

Or as previously mentioned, as the verb meaning "to plug into an electrical outlet" (based on the noun "jack: a female fitting in an electric circuit used with a plug to make a connection with another circuit"):

Hey could you jack my guitar into the amp?

It's a fun word. Remember, though -- slang isn't universal. I don't know if these meanings will translate anywhere English is spoken. Also it's constantly evolving, so terms can take on a different nuance over time.

Here is a list of various other definitions for "jack", although even this is not complete

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    AmE speaker here: I've never heard "jacked up" to mean "hurt" or "ruined," but I'm pretty old so I may be out of touch. Also, one can be jacked up without using illegal drugs -- the body naturally produces adrenaline. Otherwise, this is an excellent answer! – Mark Hubbard Dec 16 '16 at 16:39
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    A female Australian grad student who served as a Resident Advisor in the university dormitories came to breakfast looking unusually tired one morning and said, "I got knocked up at 3:00 a.m.," and then wondered why we all laughed. When we asked her if she was going to the football game to "root for the team," she turned bright red. Ah, the vagaries of English slang. :-) – Mark Hubbard Dec 16 '16 at 16:49
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    Another slang meaning of "jacked" is "muscular", by the way. – Patrick Stevens Dec 16 '16 at 21:17
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    FWIW, I first heard "jacked up" to mean "messed up" about twenty years ago, in urban Michigan. – 1006a Dec 16 '16 at 21:59
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    @MarkHubbard I've often heard 'jacked up' used as a synonym of 'f%cked up' and not in the drunk or drugged sense. I think it might be the first way I heard it used outside of car maintenance. I think 12-15 years ago. I also know of a kids rhyme with the phrase "mess with me and I'll jack you up" – JimmyJames Dec 17 '16 at 2:23

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