"Rum Pum Pum Pum" (single) was leading song of the album " Pink Tape". The album was the only K-pop album to be featured on US music channel Fuse's "41 Best Albums of 2013" and was named the "Greatest K-pop Album of the 2010s" by Billboard. "Rum Pum Pum Pum" was ranked at number 59 on Billboard's "100 Greatest Girl Group Songs of All Time" list. In a panel of 47 music and pop culture critics organized by The Hankyoreh and Melon, it was ranked at number 96 in a list of the 100 best K-pop albums, making it the only album by an idol group to make the list. "Rum Pum Pum Pum", the album's single, is a dance-pop song with exotic hand drums, whiplash-y snares, funky sixties' guitar riffs, and synthesized squirt. Lyrically, it expresses first love on a wisdom teeth. f(x) compare themselves to the pesky molars in another one of their typically bizarre metaphors, with lyrics like, “Attention boys! I’m a bit different / I pushed aside all the others and took my place,” and, “I will pierce through your heart’s wall and grow.” The song topped the Billboard K-Pop Hot 100 chart, marking the first number one single for the group on the Billboard Korea charts.

The single was co- written and produced by Dsign Music.