informal. /bjK.aY/ us. /bjK.ao/ an expression of surprise and, usually, pleasure, for example when something happens successfully: I was just about to borrow some money when bingo!When all the numbers required to win a prize have been marked off, the player shouts in order to attract the caller's attention. There are no formal rules as to what can be shouted, but most players will shout "yes" or "bingo".
