Tito says Canelo by KO with a left hook in the 3rd "OVER UNDER"??

[extracurRICular]

please pardon my ignorance and school me:

What is over/under?

The only thing i remember with under is:

"I come from a land down under..." Men at Work

Last over three rounds or under three rounds.

What he said............

[extracurRICular]

Turns out Tito was off by 6 rounds but called the left hook doe.......