“1” is a song by Yung Bambi and ZOTiYAC, in which they rap about sex, drugs and getting cash while wearing the clothing brand, Calvin Klein.

The song gained immense popularity after its lyric “Calvin Klein on my dick” would go viral on TikTok. On January 4, 2021, a TikTok remix of the song was posted on the platform, starting the popular trend known as “You gotta expect the unexpected,” a trend where teens would change their appearance to look more attractive then they had previously looked.

Following the trend, it has become Yung Bambi’s most popular song, having over 7 million streams on Spotify.