It means like eating bagels. A bagel is a doughnut-shaped bread that looks like a doughnut. Cream-yellow bagel bread will be sprinkled with sesame seeds or nuts, which is harder and tougher than ordinary bread, and can be baked or boiled, and will be softer. Bagels are a very popular bread in the west and are sold in many areas. The network language bagel head means like eating bagels.