A mom tattoo is a medium to large tattoo on a mother, usually with flowers and/or hearts and scrolls with the name of her children. The design style will be based in the era directly preceding the woman becoming a mom, as that will be the last time she had time to look at tattoos, and received approximately five years after her last child, when the desire to show the world she's still cool is at the fullest.
My mom is thinking about running for president of the PTA, but I told her she better cover up her mom tattoo until after the voting ends.