Crunk is a subgenre of southern hip hop that emerged in the early 1990s and gained mainstream success during the early to mid 2000s. Crunk is often up-tempo and one of Southern hip hop's more nightclub-oriented subgenres. Distinguishing itself with other Southern hip hop subgenres, crunk is marked and characterized by its energetic accelerated musical tempo, club appeal, recurrent chants frequently executed in a call and response manner, multilayered synths, its pronounced reliance on resounding 808 basslines, and rudimentary musical arrangement. An archetypal crunk track frequently uses a dominant groove composed of a nuanced utilization of intricately multilayered keyboard synthesizers organized in a recurring pattern, seamlessly shifting from a lower to a higher pitch that encompasses the song's primary central rhythm, both in terms of its harmonic and melodic aspects. The main groove is then wrapped up with looped, stripped-down, and crisp 808 dance claps and manipulated snare rolls coupled and accompanied by a bassline of thumping 808 kick drums. The term "crunk" was also used throughout the 2000s as a blanket term to denote any style of Southern hip hop, a side effect of the genre's breakthrough to the mainstream. The word derives from its African-American Vernacular English past-participle form, "crunk", of the verb "to crank". It refers to being excited or high on drugs.

Southern hip hop, also known as Southern rap, South Coast hip hop, or dirty south, is a blanket term for a regional genre of American hip hop music that emerged in the Southern United States, especially in Atlanta, New Orleans, Houston, Memphis, and Miami—five cities which constitute the "Southern Network" in rap music.