}: [ Meaning in Chat or Text Messages Online

This internet slang "{: [" is known as an emoticon or ASCII art and is often used to indicate anger or frustration in chat or conversations. The symbol combination suggests a furrowed brow and mouth downturned in a scowl or frown.

For instance, you may be having a heated discussion with a friend and they make a statement that angers you. You might respond with "{: [ dude, I can't believe you just said that!" or, in a work context, you might use it in frustration when an important project deadline is approaching and you feel like you're not making enough progress: "{: [ Why is this taking so long?!"

The emoticon can be paired with other text or used alone to convey your emotions. However, it's worth noting that not everyone understands the meaning of emoticons or ASCII art, so be cautious when using them and ensure that your message is clear.