The term 'OFT-TATTOOED WORD' can be solved by the three letter word 'MOM'. This phrase is often used to describe a phrase that is so commonly used that it is almost like a tattoo, as it is so deeply ingrained in our culture. It is often used to refer to words or phrases that are so widely used that they become part of our everyday language. In this case, the oft-tattooed word is 'MOM', which is a term of endearment for one's mother.