The word 'whiz-bang' is a compound formed from two distinct onomatopoeic elements, 'whiz' and 'bang', each imitating a specific sound. It originated in military slang during World War I to describe a type of small-caliber, high-velocity German artillery shell, named for the sound it made: the 'whiz' of its approach followed immediately by the 'bang' of its explosion. This vivid auditory representation led to the term's figurative extension to describe anything that is strikingly fast, effective, or sensational, capturing the sudden and impressive impact of the original referent. The logic of the word's formation is purely phonetic and experiential, building its meaning directly from the sequence of sounds it denotes.

Structure: whiz (sound) + bang (sound) - whiz: (Onomatopoeic, imitative of a swift, hissing sound) The functional role is to represent a high-speed, buzzing sound. - bang: (Onomatopoeic, imitative of a sudden loud noise) The functional role is to represent a sudden, explosive sound.