Caramelldansen refers to the iconic Swedish pop song by Caramella Girls, which became a global internet phenomenon in the late 2000s when it was paired with an animated loop of characters performing a rhythmic hip-swinging dance. The 'Lights' variation specifically emphasizes the vibrant, flashing rainbow strobe effect associated with the track's high-bpm energy. It is frequently used to represent a sudden shift in mood, where a quiet or serious moment is interrupted by an explosive, neon-colored dance party. The meme has evolved from its early 4chan and YouTube roots into a universal symbol for chaotic joy, ADHD energy, and retro internet nostalgia.