It's generally used online in a sarcastic or mocking way, often to express:
* Frustration: When someone feels annoyed by the actions of another person and blames them for a situation.
* Sarcasm: Used to acknowledge someone's mistake or misfortune, often in a condescending tone.
* Ridicule: To emphasize that someone has done something foolish or wrong.
For example:
* "I lost my phone again."
* "YDI! You should have put it in a safe place."
It's important to note: "YDI" can be considered rude and offensive, as it implies blame and lacks empathy. Be mindful of your audience and the context before using it.