"Mmm Yeah" is a dance-pop song which contains a "swirling" production, funk-influenced trumpets, a percussion-heavy four on the floorelectropop beat, and influences of Chicago house, hip hop, and Latin music. It is written in the key of G♭ minor. The track heavily samples lyrics from Lidell Townsell's 1992 single "Nu Nu", especially in the chorus. Lyrically, the song speaks of being rejected by an attractive woman walking down a street: "We can do whatever/ Do whatever we want/ When she walked past me I said 'hey, hey, hey' So tell me where you from where you want to go/ She walked past me like I ain't say a word".
The official music video was released on March 13, 2014 featuring Pitbull. It was directed by Gil Green, who previously worked with Mahone for his "Banga! Banga!" music video. Throughout the video, Mahone and Pitbull are shown dancing with girls in a room with a moving floor with speakers and a couch, a concept reminiscent of the 1996 video for "Virtual Insanity" by Jamiroquai. This music video was certified in the digital platform Vevo on February 3, 2015 and it's Mahone's second Vevo Certified.
"Mmm Yeah" debuted at number 60 on the BillboardHot 100 on the week of February 8, 2014, and eventually peaked at number 49, resulting in the song becoming Mahone's highest charting single on the chart, surpassing "What About Love". The song has also reached number 19 on the BillboardPop Songs chart. On June 16, 2014, "Mmm Yeah" became Mahone's first single to enter the Australian Singles chart, entering at 39. It also reached number 1 on the BillboardHeatseeker Songs chart. The single was certified gold as expressed by Mahone on his official Twitter account on the 6th May 2014.