Шухер (шухера is the genitive case) is a slang term that means "trouble," "commotion," or "a stir." It's often used in a context of something illicit or exciting happening.
In this song, the line "Она хочет шухера" (She wants trouble/a stir) suggests that the girl is looking for excitement, drama, or perhaps even a bit of danger. It's an interesting word because it's not standard Russian and carries a specific, edgy connotation, making it memorable and unique to the song's vibe.
"FaceTime (Не Изменяла)" is a boastful rap from Baby Melo and Spyrofoam about denying a partner's accusations of cheating. The narrator brags about his money, his reputation, and the women around him, insisting through the chorus that none of it happened: "she didn't cheat, I was just checking." The hook ties it all together as an outright fantasy, repeating that it's all not true, it's all made up.
Under the swagger, the song plays with the classic he-said/she-said of a public breakup. He mocks rumors, calls out a friend for spreading gossip, and FaceTimes his brother to settle the drama rather than deal with it directly. It's less a resolution than a performance of confidence in the face of accusations.