Sigma Boy is a Russian pop song by Betsy and Maria Yankovskaya released in 2024, which spread widely on TikTok and in short-form edits built around sigma male and brainrot humour. The muffled audio version keeps the catchy chorus recognisable while removing clarity, a common editing treatment used to suggest music playing in another room or inside a character's head. That contrast helped the clip circulate in ironic memes, where an anthem meant to sound confident is made to sound washed out, distant and slightly absurd.