“abcdefu” is a song by the artist GAYLE, released in 2021. It gained popularity for its catchy melody and relatable lyrics, which express feelings of frustration and empowerment after a breakup. The song's title is a play on the alphabet, cleverly incorporating a message of moving on from a toxic relationship. The track blends elements of pop and rock, showcasing GAYLE's distinctive vocal style. It resonated with many listeners, leading to significant streaming success and social media engagement. The song's candid approach to heartbreak has made it a favorite among young audiences navigating similar experiences.