A tradition seen in New Zealandhigh schools where at the end of the year, students strip down to their underwear and run across their school grounds (or another school)
Person 1 - "Did you hear? Steve went to the grundyrun yesterday!"
Person 2 - "No shit Sherlock, like two thirds of the school went."
A clingy gay person that when looking at a boy or a girl gets a boner. A grundybeans will hug you alot if you are his friend, and calls you rasist if you do something offensive even if it has nothing to do with race.