As we stated before, “Erin go Bragh” signals one’s loyalty to Ireland, so what better day to express your devotion than St. Patrick’s Day? If someone says it to you, make sure to respond in kind. Try “Happy St. Patrick’s Day” or “Sláinte,” the Irish toast that loosely translates to “good health.”

Source: https://www.distractify.com/p/what-does-erin-go-bragh-mean