Betsy had been recording songs for several years.[22] Notably, her "Simple Dimple Pop It Squish" ("Симпл Димпл Поп Ит Сквиш") was popular in Asia.[23] Maria Yankovskaya is a blogger and a regular host at СTC Kids, a Russian children's TV channel.[c] On 19 October 2024, Betsy and Maria Yankovskaya received the CTC Kids' SuperLikeShow award in the "Super Trend" category. They also performed their song "Sigma Boy" on stage during the award ceremony.[26]
The song was written by Betsy's father, composer Mikhail Chertishchev [ru],[2] in collaboration with rock singer Mukka [ru],[27] most notable for the song "Girl with a Bob Haircut" (Russian: "Девочка с каре").[28] According to Chertishchev, when writing songs, they come to him spontaneously and do not initially "have any meaning". He records them on a dictaphone and later evaluates their "virality".[29]
The song's success is credited to TikTok's "word-of-mouth". Notably, German TikToker Streichbruder started a trend in which he would play the song at full volume in public transport.[30]
The song has been described by some as "brain rot", due to its lyrics being seen as "nonsensical" because of its use of the term "sigma".[30]
According to Betsy, the song's meaning is "the idea is that Masha and I are so cool, and the Sigma Boy is trying to win us over, and we are trying to win him over too".[27][29] She has also explained that "the Sigma Boy is a very self-confident boy who doesn't need anyone. At the same time, all the girls fall in love with him."[d]
^"ČNS IFPI" (in Czech). Hitparáda – Digital Top 100 Oficiální. IFPI Czech Republic. Note: Select 1. týden 2025 in the date selector. Retrieved 19 January 2025.
^"ČNS IFPI" (in Slovak). Hitparáda – Singles Digital Top 100 Oficiálna. IFPI Czech Republic. Note: Select 1. týden 2025 in the date selector. Retrieved 19 January 2025.