My advice to you - based on past experience of questions involving Latin on AnswerBank - is to check with a known 'expert' whatever answer(s) you get here! For example, if your local secondary school has a Classics Department or even just a solitary Latin teacher, try to get a response from him/her. An alternative is to approach a local Catholic priest, especially an older one.
As for online translation sites, I'd treat them with even more care than answers here. They are generally much too vague or even ridiculous, unless you are quite knowledgeable about the language in any case.
Given that the answer is to form an indelible mark on your body, I strongly recommend extreme caution as to its content and a real effort to consult an expert. Good luck!