The line comes from SpongeBob SquarePants, the long-running animated series centred on a sea sponge and his starfish best friend Patrick Star. Patrick's cheerful, offbeat way of speaking has made many of his lines popular as short reaction clips, and this one stands out because he is proudly claiming a colour he is not usually associated with. Shared through soundboards, meme edits and short-form videos, it is now used as a quick punchline for self-acceptance, colour jokes and absurd confidence.