Green’s Dictionary of Slang

kafoom! excl.

[ker- pfx + foom, echoic of an explosion; var. on kabloom! excl., kaboom! excl.]

an onomat. term indicating the sound of an explosion.

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D. Kreipke Kuragawa Tunnels 🌐 James’s grenade explodes. KaFOOM! Target FC-D unharmed.