"So" is a word with a variety of uses in English. It's considered slang when used in a specific way to express emphasis, agreement, or surprise.
Here are some examples:
- Emphasis: "That movie was so good!"
- Agreement: "You're so right about that."
- Surprise: "I can't believe you did that, you're so crazy!"
"So" can also be used in a more casual way to connect sentences or ideas.
For example: "I went to the store, so I could buy some milk."
While "so" is commonly used in informal settings, it's important to be aware of its context and avoid overusing it in formal situations.