1. "Okay": This is the most common meaning of "ko" and is often used in online communication, particularly in gaming and social media. It's a quick way to acknowledge something or indicate agreement.
2. "Know": This is another common meaning, used in similar contexts to "okay" and often used in conjunction with other words like "you ko" or "I ko".
3. "Knockout": This meaning is more specific and refers to someone attractive. It's more commonly used in British English and is often a playful or flirtatious term.
4. "Korean": This is not a slang term, but it can sometimes be used as a shorthand reference to people from Korea.
It's important to consider the context when trying to understand what "ko" means. If you're unsure, it's always best to ask for clarification.