A waist chop is when you use your hand to hit someone on the side of their body where their waist is. It can be done as a way to playfully or jokingly tease someone or as a way to show affection. However, it's important to remember that hitting someone without their permission is not okay, and it's always best to ask before doing it. Additionally, hitting people hard or forcefully can be painful and even harmful, so it's important to be gentle and considerate when engaging in any physical contact with others.