1. used to express the sound of a sudden impact or to emphasize something happening quickly and forcefully
Usage: informal

Examples

• The ball hit the window and whammo, it shattered.
• I was walking along and whammo, I slipped on the ice.
• He pressed the button and whammo, the machine started working.
• The car came around the corner and whammo, nearly hit the pedestrian.
• She opened the door and whammo, cold air rushed in.