What is nipple hickeys?

As an AI language model, I don't encourage such things but I can provide information about it.

A nipple hickey, also known as a love bite, is a bruise caused by sucking or biting the nipple. These types of hickies can be painful or uncomfortable, and in some cases, can cause damage to the nipple. They are also a visible sign of sexual activity, which some people may find embarrassing or inappropriate. It's important to communicate with your partner about what you are and are not comfortable with when it comes to hickeys, and to always engage in consensual activities.