"Oh Sheit It's X" is a song by American singer-songwriter Thundercat. He co-wrote it with record producers Flying Lotus, Mono/Poly, and Durand Furbee for his second studio album Apocalypse. Brainfeeder released it as a single on May 7, 2013. Musically, "Oh Sheit It's X" is a funk and disco song, whose lyrics describe the protagonist in an altered state of consciousness after consuming methylenedioxymethamphetamine—otherwise known as "ecstasy"—at a party.