Sus: meaning, examples and when to use it
Short answer: “Sus” means something seems strange or not honest. It is a short form of “suspicious”: “That email looks sus.”
What does “Sus” mean in English?
People use “sus” when they do not trust something or someone. It can be about a message, an excuse, a website or a person. It comes from the word “suspicious”.
Examples of “Sus”
- The email asking for my password looks sus.
A message you should not trust. - That excuse sounds sus to me.
You do not believe the story. - The website was sus, so I closed it.
You felt it was not safe or honest.
When do you use “Sus”?
- When something seems strange or not honest.
- In casual chat and online comments.
- When you want to say that you do not trust something.
Is “Sus” safe to use?
The Teen Talk lessons mark “sus” as very informal. Calling a person “sus” can sound like an accusation, so be careful. At school, at work and in formal writing, say “suspicious”. Slang changes fast, so its meaning can change.
Common mistakes with “Sus”
- Do not call a person “sus” if you do not know them well. It can sound rude.
- It does not mean “fun” or “cool”.
- Do not use it in a formal email.
Similar expressions
- For lies, use “cap”. For the opposite of a lie, “no cap”. Group: slang about honesty.
Questions
What does “Sus” mean in English?
“Sus” means something seems strange or not honest. It is a short form of “suspicious”: “That email looks sus.”
Is “Sus” safe to use?
The Teen Talk lessons mark “sus” as very informal. Calling a person “sus” can sound like an accusation, so be careful. At school, at work and in formal writing, say “suspicious”. Slang changes fast, so its meaning can change.
What does “sus” stand for?
It is short for “suspicious”.
Can I call my friend “sus”?
Only as a joke and only if your friend will not feel accused. It can sound rude.
Part of the English slang guide and of slang about honesty, in the 🗣️ Teen Talk tool.
Written for English learners by the English for Fun team. How we write our lessons · Last updated 2026-11-05.