Ah Yeah (stylized as AH YEAH) is the second extended play by South Korean girl group EXID. It was released on April 13, 2015 by Yedang Entertainment and distributed by Sony Music. "Up & Down" was released as the lead single while its title track served as the follow-up single from the album.

On 4 March 2015, a representative from EXID's label spoke to Star News that the group is working on a new song, scheduled to be released in the second week of April. However at the time, it was undecided if the song would be released as a single or with a mini-album. On 3 April, the album's cover art and tracklist were leaked online, prompting Yedang to issue a message the following day, stating that they would take legal action if the leak harms the group's comeback success.

The group held a showcase at Noon Square in Myeongdong on 12 April in which they revealed and performed "Ah Yeah" to the public for the first time.

As of October 2015, the album has sold close to 41,000 copies in South Korea and 7,000 copies in Japan.

The album was composed by Shinsadong Tiger, who has been the group's producer since their debut. Member LE also participated in the album's production, co-writing and composing all the songs on the album. The title track, "Ah Yeah", is a hip-hop style dance song with a repetitive hook. "Pat Pat" is described as an "urban R&B" song and "With Out U" as an "urban dance" song. The album also includes their previous single "Up & Down" as well as a new version of "Every Night."

"Up & Down" (Hangul: 위아래; RR: Wiarae) was pre-released as a digital single on 27 August 2014, and is composed and produced by the group's long-time collaborator Shinsadong Tiger, Namking Nang and member LE. It was the group's first release with Yedang Entertainment after signing with the company in June 2014. The corresponding music video was released with the single, and directed by Digipedi.

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