Squidward Tentacles is the grumpy neighbour from SpongeBob SquarePants, a character long used for deadpan reaction memes. The phrase what the sigma grew out of Gen Alpha internet slang, popularised through TikTok and short-form videos where sigma refers to a confident, independent archetype. Pairing the two creates a generational joke: an older cartoon character confronting language he does not understand. That contrast helped the clip circulate in reaction edits, gaming videos and meme compilations, where it now functions as shorthand for confused disbelief.