A public incident which subjects others to one's own germs/ diseases.
"That guy made no effort whatsoever to cover his sneeze. That was a total Public Display of Infection."
A postmodern abstract concept whose definition is entirely context dependent.
"Remember that time when i saw you at the supermarket? That was so yaoleif!"
"She told me likes to go to the beach. How yaoleif!"
"Sorry, I don't date yaoleifs."