"Chillin" is a song by American rapper Wale, featuring singer Lady Gaga. It was released as the lead single from his debut album, Attention Deficit, on April 14, 2009, by Allido Records. Wale had wanted to collaborate with Gaga, and were introduced to each other through the rapper's mentor, Mark Ronson. "Chillin" was composed by a number of songwriters, including Wale and Gaga, while it was produced by Cool & Dre. Recorded in New York City, the song discusses Wale's life in his hometown. It has musical influence of 1990s style rapping, and contains two samples from the 1969 song, "Na Na Hey Hey Kiss Him Goodbye" by Steam, and the 1987 song, "Top Billin'" by Audio Two.

The song received mixed reviews from contemporary critics. Some praised Wale and Gaga's collaboration and composition, while others criticized it. "Chillin" reached number 12 on the UK Singles Chart, while in the United States it peaked at number 99 on the Billboard Hot 100. The song also reached the lower regions of the record charts in some other nations. The accompanying music video features both Wale and Gaga in various locations in and around Washington D.C. and Boston, Massachusetts.

Wale had wanted to collaborate with Lady Gaga on the track since January 2009, believing that she embodied the party-record feel of the song. He explained: "If music was a high school, I feel like I'll be the dude on the football team, and it would be like, 'OK, Gaga's having a party!' And you know all the bad girls are going to be out there." Upon hearing that some were surprised by the collaboration, Wale went on to say, "If Jay-Z can work with Coldplay, then Wale should be able to work with Gaga." Wale's mentor, Mark Ronson, sent the track to Gaga. She commented that her portion of the song, which includes lyrics such as "Lookin' at, lookin' at, lookin' at me/ Eyes all stickin' like honey on bees", is narcissistic, but in a positive way. The lyrics capture the life and image of Wale's home areas Maryland and District of Columbia. About incorporating the hook in the song, Gaga said:

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