Here are a few possibilities:
1. A threat: "I'm gonna put a hit on your neck" - This is a violent threat, meaning someone is going to harm or kill you.
2. Responsibility: "That's on your neck" - This means someone is responsible for something, or it's their problem to deal with.
3. Risk: "You're putting your neck on the line" - This means someone is taking a big risk or facing danger.
4. Humorous: "Don't get your neck in a twist" - This is a lighthearted way to tell someone not to worry or get upset.
Important note: It's crucial to pay attention to the context when someone uses the phrase "your neck" as its meaning can vary widely. If you're unsure about the meaning, it's always best to ask for clarification.