The Fat EP is an EP by the American punk rock band the Descendents, released in 1981 through New Alliance Records. It was the band's first recording with singer Milo Aukerman and established their presence in the southern California hardcore punk movement, with short, aggressive songs that represented a shift in style from their previous new wave and surf sound. The EP was re-released in later years as part of several compilation albums.

The Descendents' initial recording lineup of guitarist Frank Navetta, bassist Tony Lombardo, and drummer Bill Stevenson released the band's 1979 debut single "Ride the Wild" / "It's a Hectic World", with a sound that blended Devo-like new wave and Dick Dale-style surf music. Stevenson sold copies of the single to fellow students at Mira Costa High School, attracting the attention of classmate Milo Aukerman, who began attending the band's practices regularly. Aukerman soon became the band's lead singer after jumping in to sing with them at practice.

The addition of Aukerman and the consumption of large amounts of coffee led the band to write shorter, faster and more aggressive songs in a hardcore punk style. Stevenson attributed the change partly to the band's invention of the "Bonus Cup": "We took ⅓ of a cup of instant coffee grounds, added some hot water, threw in about 5 spoonfuls of sugar, and proceeded to play 10 second songs. The Bonus Cup became a part of everyday Descendents life". "Caffeine makes you hyper", said Lombardo, "In general, it makes you want to play faster." Aukerman later recalled: "We started drinking too much coffee; 'cause of that and the addition of me, the music became very quick and all about bursts of energy. It's interesting: we started very melodic, then moved to hardcore, but melded the two at a certain point and became melodic hardcore".

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