"Kool Thing" was the first major label single from American alternative rock band Sonic Youth's 1990 album Goo. It was released in June 1990 on Geffen Records. The song was inspired by an interview bassist/singer Kim Gordon conducted with LL Cool J for Spin in which the two artists clashed. Although he is never mentioned by name, the song's lyrics contain several references to LL Cool J. Gordon's lyrics make reference to several of the rapper's works, including the single "I Can't Live Without My Radio" and the album Walking With a Panther. She also repeats the line "I don't think so", which appears in LL Cool J's "Going Back to Cali". Chuck D also contributed some vocals to the song.

The music video for "Kool Thing", released on June 4, 1990, was the band's first for a major label. The video was directed by Tamra Davis. The video focused on Gordon's fascination with 1960s radicalism (particularly Patty Hearst and the Black Panthers), and featured the band wearing glam style clothing. The video was stylized after LL Cool J's "Going Back to Cali" video, down to the black-and-white camera and go-go dancers. Gordon initially wanted to wear a beret and carry an Uzi, as a self-described "poseur-leftist girl lusting after Black Panthers concept". However, Geffen vetoed the plan. Chuck D appeared in the video.

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