Sigma Boy is a 2024 Russian pop song by singers Betsy and Masha Yankovskaya, built around a simple repeated chorus and a dance beat. It spread quickly on TikTok in late 2024, where users paired it with edits celebrating the sigma, or lone wolf, archetype from online slang. The song later reached viral charts internationally and inspired many remixes, including bass boosted versions that push the low end harder. Its short hook and confident tone keep it used as shorthand for ironic self-assurance online.