The story
In Gaelic games, including hurling, the "senior" grade is the highest level of competition. In 2007, the Green Party entered government for the first time in coalition with Fianna Fáil, and Séamus Brennan of Fianna Fáil quipped to the Green Party ministers, "you're playing senior hurling now".
Etymology from Wiktionary, CC BY-SA 4.0.