A tattoo is a lasting mark chosen for the skin, so it is read as identity, commitment and what you want others to know about you. A new one stands for a change you mean to keep. Regretting a tattoo points to doubt about a decision that is hard to undo. Seeing a tattoo on someone else is read as noticing what defines them. A tattoo with a word or symbol is often taken as a message the dreamer wants to remember.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.