I have no idea who Tim McGraw is (apparently a country singer of some sort?) but this is a mildly entertaining video of him losing his ring while shaking hands with some of his fans in the middle of the song.
This was obviously a complete accident. If you watch it closely, a woman (in a light blue shirt) appears to accidentally pull off Tim’s ring while shaking his hand (perhaps a little to tightly) a few seconds before he notices it’s gone. She instantly starts to wave it around to try to get his attention and continues to do so the entire time he’s accusing the other girl (who has no clue what’s going on). Just a simple misunderstanding.