Has an AFL game ever ended 100-31?
Exactly once. On July 15, 2021, Geelong beat Fremantle 100-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 100-31 in league history.
That makes 100-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 101-31 has happened 2 times and 100-32 has happened 2 times.