sus means Suspicious; giving off the feeling something isn't right. It's mostly used on TikTok and short-form video. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
sus
Suspicious; giving off the feeling something isn't right.
Etymology timeline
Born ~2020 · no dated citations yetSeen in the wild
If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Sus&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.
This one-dimensional aspect of the SUS is both a benefit and a drawback because the questionnaire is necessarily quite general.
If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Sus&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.
This one-dimensional aspect of the SUS is both a benefit and a drawback because the questionnaire is necessarily quite general.
Definitions
Suspicious; giving off the feeling something isn't right. "He's acting sus" = something's off. Can target a person, a story, or a plan. Lives somewhere between vague paranoia and actual evidence — usually the vibe tells you before the facts do.
"He's been acting sus since his phone started blowing up at 2 AM."
sus means Suspicious; giving off the feeling something isn't right. It's mostly used on TikTok and short-form video. It's casual and generally safe with friends and online. It's standard online vocabulary; nothing inherently concerning about hearing it.
"sus" is slang. It means: Suspicious; giving off the feeling something isn't right. Register: casual. Use it in: casual conversation and online posts. Avoid in: formal writing and professional emails. A more formal way to say this is "suspicious".
“If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Sus&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.”
“This one-dimensional aspect of the SUS is both a benefit and a drawback because the questionnaire is necessarily quite general.”
“If an [internal link](https://en.wikipedia.org/w/index.php?title=Special:WhatLinksHere/Sus&namespace=0) incorrectly led you here, you may wish to change the link to point directly to the intended article.”
“This one-dimensional aspect of the SUS is both a benefit and a drawback because the questionnaire is necessarily quite general.”
Comments (1)
Calling something 'sus' is a vibe-based accusation, not a formal one — it signals suspicion without claiming proof, so treat it as a prompt to look closer rather than a verdict. It can target a person, a story, or a plan equally. — Slangora Editors
"Sus" has gradations: slightly sus (something's off), lowkey sus (suspicious but you want to believe), mad sus (actively suspicious), bro sus (the homoerotic-misstep flavor used as gentle teasing).
"He memorized her coffee order on day one. Little sus, bro."
Comments
Pre-Among Us: "sus" was used as British slang for "suspicious" since the 1930s. Long history before the 2020 viral revival.
"Stopped and searched under the sus law."
Comments
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.
Used in
Have a better definition?
Add your own interpretation of "sus".
Related vocabulary
Compare with…
Head-to-head pages explaining the difference.
🔥About Gen Z & TikTok slang
The words defining how Gen Z and TikTok talk right now — from rizz and aura to skibidi, delulu, and the ick. Updated as fast as the trends move.
See all Gen Z & TikTok slang on Slangora.
Tags
Other words near "sus" (S)
Browse all slang words starting with S.
Related terms
Semantically related
- sus coded75%
Sus coded describes someone or something that radiates suspicion as a core aesthetic or personality trait — not one shady act, but a whole vibe that reads sketchy by default. The '-coded' suffix, borrowed from identity discourse, signals that sus isn't something they're doing but something they fundamentally are. Sus coded is often used with affection or humor about fictional characters, public figures, or friends who can't help giving off untrustworthy energy even when they're doing nothing wrong. It's a diagnosis, not an accusation.
- sus szn74%
Sus szn — short for sus season — names a collective cultural moment when everyone around you suddenly seems untrustworthy, sketchy, or weirdly off. It's not one person doing something shady; it's the whole vibe curdling at once. Sus szn might hit around school drama cycles, after group chat leaks, or during a particular stretch of situationship chaos. The 'szn' suffix borrows from sports culture to frame a temporary period of heightened sus energy, implying it will eventually pass.
- sus bih74%
A bih whose motives, loyalty, or behavior pattern triggers suspicion — someone you keep in your orbit but watch carefully because something about their energy doesn't fully add up. The sus bih might be two-facing, might be moving messy behind the scenes, or might just have an energy that keeps setting off alarms without the concrete evidence to explain why. Group chats are often the natural habitat for discussing the sus bih: 'something is OFF with her.'
- sus fail74%
A sus fail is when someone tries to act normal or trustworthy but their suspicious behavior is so obvious it backfires spectacularly — the opposite of a successful deception. The 'fail' modifier introduces comedy; where sus describes the vibe, sus fail describes the execution going wrong. It's the moment the lie collapses in real time, the alibi that falls apart immediately, or the cover-up that's somehow more suspicious than the original behavior. Sus fail is peak drama content.
- sus energy73%
Sus energy is the ambient, undeniable aura of sketchiness that some people or situations put out before you can even identify a specific cause. It's the gut feeling that something isn't right, embodied as a social field you can sense. Where sus describes a verdict, sus energy is the pre-verdict atmosphere — the raised hairs on the back of your neck translated into slang. Someone can give off sus energy without having done anything provably wrong; the vibe itself is the red flag.