"Hot Girl Summer" is a song by American rapper Megan Thee Stallion featuring Trinidadian rapper Nicki Minaj and American singer Ty Dolla Sign. It was released on August 9, 2019. Commercially, the song debuted atop the US Rolling Stone 100, marking the first number one for all of the performers, and the first female collaboration and fourth overall song to reach the top of the chart.
In July 2019, the term "hot girl summer" went viral on social media and subsequently became a meme prior to the release of the song. The title originally stems from a line on "Cash Shit" where the rapper calls herself "thee hot girl". The phrase also appeared on the artwork for her 2019 mixtape Fever. Megan first teased the song in a tweet on July 18, stating "I feel like it’s only right I drop a hot girl summer song before the summer is over." On July 28, 2019, Megan posted a snippet of the song to her Instagram. She also revealed the release date to be August 2 but it was later postponed to August 9. On August 5, 2019, it was announced that the song would feature Nicki Minaj which turned out to be the cause for the delay. Minaj revealed that the collaboration almost did not happen due to her almost losing her voice. The song samples "Act Up" by the City Girls.