Exactly what it says — “I don’t know”. Often paired with “idc” (I don’t care).
How to use it
Casual uncertainty: “idk maybe we watch something else”.
Examples
- idk what to have for dinner, ideas?
Chat slang
What does IDK mean?
IDK
stands for “I Don’t Know”
Stranger: what kind of music are you into
You: idk, bit of everything. what are you listening to rn?
Stranger: a lot of lofi lately
You: ok that tracks for a late night
Where it comes from
“I don’t know”, one of the most common abbreviations in English texting, dating back to early text messaging and instant messaging.
Is it friendly or rude?
Neutral, but context matters. A bare “idk” in reply to a question can read as disengaged, while “idk, what do you think?” keeps things moving.
Spellings and variations
“idk” is the norm, “idek” means “I don’t even know” and “idrk” means “I don’t really know”. “idk tbh” and “idk man” soften it, while capital “IDK” can sound exasperated.
Common mistakes
A lone “idk” in reply to an open question is one of the fastest ways to end a chat, because it gives the other person nothing to reply to. If you really do not know, follow it with a question or an option. With strangers, “idk” can also be a polite way to sidestep a personal question, and it is fine to use it that way.
How to reply to “idk”
- Narrow it for them: “pick between two then — pizza or noodles?”
- Make it easy: “no wrong answer, first thing that comes to mind”.
Questions about IDK
Is idk rude?
Not by itself, but a one-word “idk” can end a conversation. Add a follow-up question to show you are still interested.
What does idk idc mean?
“I don’t know, I don’t care.” It signals indifference or, more often, genuine indecision.
Related slang
More in Chat Slang Decoded and random chat etiquette.
Try it: use “idk” on a real stranger
idk what to talk about, so: best food you’ve ever had?
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