'bams' originates from English, specifically from the imitative/onomatopoeic word 'bam' which imitates a sudden, sharp sound.

'bam' appears in early modern English as an onomatopoeic imitation of an impact sound; 'bams' is simply the plural or inflected form used in later usage.

Initially it meant 'a sudden loud noise' and over time it has retained that basic meaning when used as 'bam' or 'bams'.