That means you put your chip in the box yourself to make the bet. These are self-service bets that you make yourself without help from the dealer. The boxes for these bets are stamped with “Big 8” and “Big 6” in large font so they’re easy to see. If you encounter a table that still offers the Big 8 and Big 6, you’ll see them by the Pass Line where it makes the 90-degree curve.