Going One, Twice, SOLD
This is a phrase that comes from the auction culture when the bidding ends. The auctioneer gives all of the potential buyers "fair warning" that their chance to bid is about to close. When the word "sold" is said, bidding on that object ends.
When this phrase comes up in other situations, it is "fair warning" from the speaker that the time for questions, comments, changing one's mind, and so forth, is ending. Like with the auction, when the speaker says "sold," they do not plan to speak on that topic any more.
A similar phrase is going, going, Gone. In a similar pattern, once the speaker says, "gone." The discussion is over. If you wait too long, you lose your chance to speak. In other words, you snooze, you lose.
If you have any questions or suggestions, please leave a comment. See you tomorrow!