zang zui is the actual expression mah.
pong pong is the hokkien onomatopoeia "ie. a figure of speech that
employs a word, or occasionally, a grouping of words, that
imitates, echoes, or suggests the object it is describing, such as
"bang" or "click", or animal noises such as "moo", "quack" or
"meow".
Onomatopoeic words exist in every language, although they are
different in each."
