This sound comes from the hit song "Blue (Da Ba Dee)" by Italian group Eiffel 65, released in 1998. The track became a major pop and club hit, and its chorus stayed widely recognizable long after its chart run. Online, short clips of the "I'm blue" line spread through meme edits, reaction posts, and color-based jokes, especially when something visibly blue appears on screen. It still gets reused because the melody is instantly identifiable and the lyric is simple enough to become a quick visual punchline.