Has an AFL game ever ended 148-51?
Exactly once. On April 5, 1986, Essendon beat Geelong 148-51, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 148-51 in league history.
That makes 148-51 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 149-51 has happened never and 148-52 has happened never.