Bam/bæm/ Definition 1 of 3Pro Tip 1/3Sudden Occurrence Indicates an unexpected event, usually causing surprise or alarm. Everything was calm until bam, the fireworks started. Pro Tip 2/3Onomatopoeia Mimics the sound of the event it describes, enhancing the listener's experience. The vase hit the ground with a bam, startling everyone. Pro Tip 3/3Not Literal Doesn't always correspond to an actual sound, can describe an impactful event. He won the game, and bam, he became famous overnight.