The word "掰掰" is formed through the reduplication of the character "掰", which itself is a pictophonetic compound composed of two "手" (hand) radicals positioned on each side of the character "分" (meaning to divide or separate), graphically depicting the action of pulling apart with both hands. This duplication creates an informal term for "goodbye", phonetically approximating the English "bye-bye" while conceptually aligning with the idea of parting or separation.