Is it possible to contract HIV from someone else if you have an oral piercing?

Question not clear. It is always possible to contract HIV but only by some form of very intimate contact. If you have a tongue piercing which has not fully healed and you engage in oral sex with ejaculate in your oral cavity from an individual with HIV disease the answer is yes. Conceivably the same thing might take place if you had oral sex with a woman who had HIV in her vaginal secretions before tongue healed.