Questions about example sentences with, and the definition and usage of "Poppong"

A: Popping? There is no English word “poppong” although there are the words “pop”, which can be like the sound of a cork being taken off a bottle of sparkling wine, and “pong” which is commonly used instead of “bad smell”.
We might say “What’s popping?” when asking “What’s going on?” in a situation such as a party, meaning “is there anything exciting going on?”