A hip hop artist commonly grouped by stereotypes such as:
Wearing skinny jeans
Talking about guns, drugs, and hoes
In reality, a mainstream rapper is just someone on a major label who gets radio play and sells a lot of records.
Truthfully, a lot of mainstream rappers suck, and mainstream rappers who are good are generally considered "underground" even if they run the radio.
Guy1: I liked Eminem's Marshall Mathers LP CD, but then he became a mainstream rapper.
Guy2: He was always mainstream, the MMLP sold 1.1 million in the first week!