This is probably the quintessential example of what I'm talking about. I was actually surprised to learn they didn't coin it themselves. It's not even a word, but it has so much meaning. It's an entire mood and everyone knows what it means. Lisa says it to Homer in an offhand exchange. It's not even a joke but I will never not laugh at it.
The hullabalooza episode in reference to the younger generation being apathetic to the world. (Neither Highs nor Lows)