1. To surprise or impress someone. This meaning is usually used in a positive context. For example:
* "That new restaurant really lit me up. The food was amazing!"
* "Her performance on stage lit up the whole audience."
2. To anger or irritate someone. This meaning is usually used in a negative context. For example:
* "He lit me up when he said that about my family."
* "Don't try to light up the boss by complaining about your coworkers."
The specific meaning of "light up someone" can depend on the context and the tone of voice.
It's important to be aware of the different meanings of this slang term, as it can easily be misunderstood if used in the wrong context.