"Psycho" is a song by American rapper Post Malone featuring American singer Ty Dolla Sign. It was released through Republic Records on February 23, 2018, as the third single from Malone's second studio album, Beerbongs & Bentleys (2018). The artists wrote the song with Louis Bell, who produced it with Malone. Lyrically, the song discusses the artists' lifestyle and explores the theme of excessive fame and trust issues. The song entered at number two on the US Billboard Hot 100 behind Drake's "God's Plan", and reached number one in June 2018, becoming Malone's second and Ty's first chart-topper.