Sigma Boy, written in Japanese as シグマボーイ, is a Russian pop song by young singers Betsy and Masha Yankovskaya released in 2024. Built around the internet sigma male meme, the track went viral on TikTok in late 2024 and spread internationally through dance clips, edits and remixes. Its short, repetitive chorus made it ideal for soundboards and meme pages, where users clip just the hook to signal playful confidence or mock-serious sigma energy in short videos.