Translation?

Harry & Nina were driving their respectable vehicles around our circle drive.
Nina cried out,

Nina: "Harry!! Mama, Harry just ran into me and it was like KaBOOM !" (motioning what it was like when they crashed)
Harry: "No, I didn't! I was just driving close and it was like Pow!"
Nina: "No, Harry..."

Daddy: "Okay wait, wait, wait.... (trying not to laugh), was it like KaBOOM or like Pow?"

(in unison)
Nina: "KaBoom."
Harry: "KaBoom."

Daddy: "Okay then (really trying not to laugh now), no more KaBooms, okay?"