Sigma Boy is a Russian-language pop song performed by young singers Betsy and Maria Yankovskaya and released in October 2024. Its catchy chorus spread rapidly on TikTok, where users paired it with confident walks, edits of fictional characters, and gaming moments. The phrase sigma boy became shorthand for a self-assured, lone-wolf attitude in meme culture, and the sound travelled far beyond Russian-speaking audiences through short-form video. Short clips of the hook remain popular because they instantly set that confident tone in just a few seconds.