A small (2" diameter) mini bagel is sliced in half with tomato sauce, mozzarella and sometimes pepperoni or sausage placed on the cut side. This is baked, toasted or microwaved until the cheese is melted. They can be found in a grocery store freezer section, or made from scratch with the component ingredients.
2. "Yo, I hit up a club last night...there was mad bagel bites."