Has an AFL game ever ended 99-27?
Exactly once. On August 10, 1901, Fitzroy beat St Kilda 99-27, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 99-27 in league history.
That makes 99-27 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 100-27 has happened never and 99-28 has happened never.