When a person rips a fat cone and exhales the smoke into a rubber balloon which then lets them inhale nitrogen-oxide (N₂O) (cream charger) repetitively until you enter the void.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

Sub-Name of TWICE MEMBER: Im Nayeon