Juice up means: To kill or seriously injure with a knife.. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
juice up
(MLE, slang) To kill or seriously injure with a knife.
Definitions
#1·Apr 27, 2026
(MLE, slang) To kill or seriously injure with a knife.
For parents
Juice up means: To kill or seriously injure with a knife.. It is informal slang, fine in casual speech but not suited to formal contexts. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.
For ESL learners
juice up means: To kill or seriously injure with a knife.. Register: very informal, slang. Suitable only for casual conversation, chat and social media. Do not use in business, academic or news writing. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself.
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#2·Apr 27, 2026
(idiomatic, informal) To charge, to charge up.
I need to juice up my phone because the battery's dead.
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#3·Apr 27, 2026
(idiomatic, informal) To make more exciting, interesting or compelling.
Juice man up with this 15 inchLike, now I got blood on my splasher
Cluster: leisure
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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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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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