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Diction and dialect

Many hip-hop listeners believe that a rapper's lyrics are enhanced by a complex vocabulary. Kool Moe Dee claims that he appealed to older audiences by using a complex vocabulary in his raps. Rap is famous, however, for having its own vocabulary—from international hip-hop slang to regional slang. Some artists, like the Wu-Tang Clan, develop an entire lexicon among their clique. African-American English has always had a significant effect on hip-hop slang and vice versa. Certain regions have introduced their unique regional slang to hip-hop culture, such as the Bay Area (Mac Dre, E-40), Houston (Chamillionaire, Paul Wall), Atlanta (Ludacris, Lil Jon, T.I.), and Kentucky (Cunninlynguists, Nappy Roots). The Nation of Gods and Earths, aka The Five Percenters, has influenced mainstream hip-hop slang with the introduction of phrases such as "word is bond" that have since lost much of their original spiritual meaning. Preference toward one or the other has much to do with the individual; GZA, for example, prides himself on being very visual and metaphorical but also succinct, whereas underground rapper MF DOOM is known for heaping similes upon similes. In still another variation, 2Pac was known for saying exactly what he meant, literally and clearly.

Rap music's development into popular culture began in the 1990s. The 1990s marked the beginning of an era of popular culture guided by the musical influences of hip-hop and rap itself, moving away from the influences of rock music. As rap continued to develop and further disseminate, it went on to influence clothing brands, movies, sports, and dancing through popular culture. As rap has developed to become more of a presence in popular culture, it has focused itself on a particular demographic, adolescent and young adults. As such, it has had a significant impact on the modern vernacular of this portion of the population, which has diffused throughout society.

The effects of rap music on modern vernacular can be explored through the study of semiotics. Semiotics is the study of signs and symbols, or the study of language as a system. French literary theorist Roland Barthes furthers this study with this own theory of myth. He maintains that the first order of signification is language and that the second is "myth", arguing that a word has both its literal meaning, and its mythical meaning, which is heavily dependent on socio-cultural context. To illustrate, Barthes uses the example of a rat: it has a literal meaning (a physical, objective description) and it has a greater socio-cultural understanding. This contextual meaning is subjective and is dynamic within society.

Through Barthes' semiotic theory of language and myth, it can be shown that rap music has culturally influenced the language of its listeners, as they influence the connotative message to words that already exist. As more people listen to rap, the words that are used in the lyrics become culturally bound to the song, and then are disseminated through the conversations that people have using these words.

Most often, the terms that rappers use are pre-established words that have been prescribed new meaning through their music, that are eventually disseminated through social spheres. This newly contextualized word is called a neosemanticism. Neosemanticisms are forgotten words that are often brought forward from subcultures that attract the attention of members of the reigning culture of their time, then they are brought forward by the influential voices in society – in this case, these figures are rappers. To illustrate, the acronym YOLO was popularized by rapper, actor and RnB singer Drake in 2012 when he featured it in his own song, The Motto. That year the term YOLO was so popular that it was printed on t-shirts, became a trending hashtag on Twitter, and was even considered as the inspiration for several tattoos. However, although the rapper may have come up with the acronym, the motto itself was in no way first established by Drake. Similar messages can be seen in many well-known sayings, or as early as 1896, in the English translation of La Comédie Humaine, by Honoré de Balzac where one of his free-spirited characters tells another, "You Only Live Once!". Another example of a neosemanticism is the word "broccoli". Rapper E-40 initially uses the word "broccoli" to refer to marijuana, on his hit track Broccoli in 1993. In contemporary society, artists D.R.A.M. and Lil Yachty are often accredited for this slang on for their hit song, also titled Broccoli.

With the rise in technology and mass media, the dissemination of subcultural terms has only become easier. Dick Hebdige, author of Subculture: The Meaning of Style, merits that subcultures often use music to vocalize the struggles of their experiences. As rap is also the culmination of a prevalent sub-culture in African-American social spheres, often their own personal cultures are disseminated through rap lyrics.

It is here that lyrics can be categorized as either historically influenced or (more commonly) considered as slang. Vernon Andrews, the professor of the course American Studies 111: Hip-Hop Culture, suggests that many words, such as "hood", "homie", and "dope", are historically influenced. Most importantly, this also brings forward the anarchistic culture of rap music. Common themes from rap are anti-establishment and instead, promote black excellence and diversity. It is here that rap can be seen to reclaim words, namely, "nigga", a historical term used to subjugate and oppress Black people in America. This word has been reclaimed by Black Americans and is heavily used in rap music. Niggaz With Attitude embodies this notion by using it as the first word of their influential rap group name.