The phrase comes from phonetic mishearings of Calvin Harris's 2014 hit Summer, whose opening chorus lines were rewritten online as wenomechainsama, tumajarbisaun, wifenlooof and eselifterbraun. The nonsense spelling circulated as captions and copypasta on TikTok and other short video platforms, where creators paired the upbeat chorus with animals, dances and deliberately literal summer scenes. Its popularity rests on instant recognition of the melody and the comedy of confident singing that says nothing at all, so it keeps returning as a shorthand for misheard pop lyrics.