A 1st Quarter "Total" or "Over Under" bet is a wager on the total amount of points in the 1st quarter from both teams combined.
With a total you will either be betting "over" which means you think the total points exceed the line or "under" which means you think the combined score will be less than the number posted.
Hawks vs Suns Total 1st Q total of 65. 1st Q Score ATL 33 PHO 30. In this example the total line was 65 points which means you are wagering if the combined score will be over or under that number at the end of the first quarter. With 63 total points in this quarter the Under bettors would win this wager.