bam 
/ˈbæm/ noun
plural bams /ˈbæm/ noun [count] informal : a sudden loud noise
▪ We heard a loud bam. — often used as an interjection to show that something has hit something or has happened suddenly ▪ I was driving along when, bam, I hit a pothole. ▪ Everything was fine, and then bam, the electricity went out.
▪ We heard a loud bam. — often used as an interjection to show that something has hit something or has happened suddenly ▪ I was driving along when, bam, I hit a pothole. ▪ Everything was fine, and then bam, the electricity went out.
