Confetti is tiny pieces of coloured paper that people throw into the air over a couple who have just married, or at a parade or a loud party, so the air fills with bright specks. In English it is almost always a mass noun: confetti was everywhere, not a confetti or three confettis. The feeling is festive and messy — fun, not formal. Though actually, the word first named sugar-coated almonds that Italians threw at Carnival and weddings; paper only later stood in for those sweets, and it partly pushed aside the older English habit of throwing rice. You may meet a rare verb, to confetti a stage, but the noun is the one that lives in ordinary talk.