Go bang Definition 1 of 3Pro Tip 1/3Sudden Event Used to describe an unexpected and usually undesirable event, like an accident. Out of nowhere, the chemistry experiment went bang. Pro Tip 2/3Dramatic Sounds Emphasizes the drama of a loud and sudden sound, usually in a large space. The cannon went bang, startling everyone in the plaza. Pro Tip 3/3Celebratory Context Often used in festive circumstances, such as parties or holidays with fireworks. At midnight, the New Year's Eve fireworks went bang.