
Oscar Harold of the Cardinal Times stated that "mumble rap" is misleading, arguing that the rappers such as Future rely more upon pop melodies and vocal effects, such as Auto-Tune, than mumbling. "Mumble rap" is nearly exclusively used as a derogatory term in reference to a perceived incoherence of the artist's lyrics. Rappers labelled as "mumble rappers" also tend to use the "aye" flow, where they add words such as "yeah", "aye" and "uh" to the start or end of their lines. "Mumble rappers" generally rap about drugs, sex, money, jewelry, designer clothing, and partying. Some have claimed that artists such as Das EFX and Fu-Schnickens rapped in a similar style years before the term was created. The term was first used to describe rappers whose lyrics were unclear, but the use of the term has expanded to include rappers that some critics claim generally put little emphasis on lyricism or lyrical quality.

There is disagreement over who first rapped in such a style, although its creation has been attributed to rappers such as Gucci Mane, Chief Keef, and most notably Future, whose 2011 single " Tony Montana" is often cited as the first mumble rap song however, there have been sources dating as far back as October 2011 of even older releases by other artists. The term "mumble rap" was first used in 2014 by VladTV battle rap journalist Michael Hughes, in an interview with battle rapper Loaded Lux about the style's emergence in mainstream hip hop. While the term mumble rap has been taken as derogatory, some have reappropriated the label and various critics and artists have defended the style as a new phase in the evolution of the genre.

The phrase "SoundCloud rappers" has also been used in a manner coextensive with "mumble rappers", referring to the artists' music distribution on SoundCloud. The term implies a mumbling or unclear vocal delivery by artists, and has been used to describe rappers who do not share the genre's traditional emphasis on meaningful lyricism.

Mumble rap (often referred to as " SoundCloud rap" ) is a loosely defined microgenre of hip hop that largely spread on the online audio distribution platform SoundCloud in the 2010s.
