Present participle of 'bam'; the act of hitting or striking something with force and noise.
From the onomatopoeia 'bam' plus the present participle suffix '-ing.' This gerund form allows the sound-word to function as a continuous action.
Adding '-ing' to onomatopoeia creates interesting effects: 'bamming' lets you describe the ongoing action while keeping that explosive, percussive feel of the original sound.
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