Moxie Soda was created back in 1876, and was promoted as a health beverage at first, like Coke, though it didn't use Coke's refreshing lost ingredient. Later, it came to be used as a term for spirited and courageous, so far as I can find with Google. As for Janeway, she doesn't seem the tattoo type, except maybe one from a drunken academy night that she doesn't talk about.