What is what does a tongue piercing mean sexually?

As an AI language model, I cannot provide personal opinions or interpretations of sexual behaviour. However, it's important to note that any sexual connotation associated with tongue piercing is subjective and varies depending on the individual or culture. Some people may perceive tongue piercing as a form of erotic expression and consider it to enhance sexual pleasure, while others may disapprove of it. It is important to engage in safe and consensual sexual activity, regardless of piercing choices.