"What's Happenin" is a song by American rapper Method Man, released on March 30, 2004 as the lead single from his third studio album ' (2004). It features American rapper Busta Rhymes and was produced by DJ Scratch. The song contains a sample of "Dum Maro Dum" by Asha Bhosle.
"What's Happenin" has been considered a more "radio-ready", "club-friendly" song among Method Man's music. It sees Method Man and Busta Rhymes delivering party-themed rhymes over a sample of a "fuzzy, muddled bass line" from "Dum Maro Dum".
Scott McKeating of Stylus Magazine commented "The initially disappointment of lead single 'What's Happenin?' ended up becoming a grower, but it's definitely more of a typical Busta type track with its 'WHUT!' chorus." Mitch Findlay of HotNewHipHop wrote that "The pair are well-matched, with Meth's cool charisma striking a match and Busta Rhyme's madcap energy serving as the fuel", additionally remarking that the song "has aged particularly gracefully, sounding almost fresh despite its raw aesthetic. The premise is simple: two veteran emcees going back and forth in the name of fun and sport, a pickup game that rises in competitive intensity with every taunt."