"I Ain't No Joke" is a song by rap duo Eric B. & Rakim, released as the second single from their debut studio album Paid in Full. It peaked at number thirty-eight on the Hot R&B/Hip-Hop Singles & Tracks. Described as one of the album's "monumental singles", Michael Di Bella wrote in the All Music Guide to Rock that "Rakim grabs the listener by the throat and illustrates his mastery of the rhyming craft". A music video was made for it, featuring dancing from Flavor Flav of the group Public Enemy. The song was selected by Jay-Z for the NBA 2K13 soundtrack. It was also featured in the video game Saints Row, as well as in the soundtrack of MLB The Show 23.

Paid in Full is the debut studio album by American hip hop duo Eric B. & Rakim, released on July 7, 1987, by Island-subsidiary label 4th & B'way Records. The duo recorded the album at hip hop producer Marley Marl's home studio and Power Play Studios in New York City, following Rakim's response to Eric B.'s search for a rapper to complement his disc jockey work in 1985. The album peaked at number fifty-eight on the Billboard 200 chart, number eight on the R&B/Hip-Hop Albums chart, and produced five singles: "Eric B. Is President", "I Ain't No Joke", "I Know You Got Soul", "Move the Crowd", and "Paid in Full".