What can you put in a woman's belly if you try hard enough? A plastic knife.
Can you explain the plastic knife joke further?
A woman is a plastic knife, use it gently and never against someone who is stronger than you.
Joking about killing people in general is frowned upon. Joking about killing women is especially bad as our society values them very much and likens them to angels. Your social standing may suffer if you are known as a woman hater.