Sigma Boy is a Russian pop song by singers Betsy and Maria Yankovskaya, released in October 2024. It went viral on TikTok during late 2024, spreading through dance clips, fancams and character edits across Europe and beyond. The title references the sigma male meme, an online archetype of the quiet, independent and self assured man. Because the chorus repeats the phrase in a simple rhythm, creators began lifting this exact section as a reusable meme sound, separate from the full song, to label confident or try hard moments.