The phrase comes from The Llama Song, a rhyming internet song built around repeating llama descriptions that spread as a viral flash animation in the mid 2000s. Its list keeps escalating from happy and sad to stranger labels, sung over photos of llamas, and the absurd repetition helped it survive as a shared childhood internet memory. Short excerpts later resurfaced on video apps, where this happy and sad pairing is used on its own as a compact mood joke.