Rowdy Lewayne Williams (born August 28, 1969), better known as Ganxsta NIP (pronounced Gangsta Nip), is a rapper from South Park, Houston, Texas and a member of the South Park Coalition, which he co-founded in 1987 with Houston rapper K-Rino.^[1] In 1992 he released his debut album South Park Psycho. This record also helped put the South Park Coalition name on the map due to world wide distribution from Rap-a-Lot. He also wrote the Geto Boys hit "Chuckie". NIP stands for "Nation of Islam Is Powerful"; he is also a part of the Nation of Islam.^[2] Williams is also looked at as one of the creators of the horrorcore rap genre.

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Ganxsta NIP's first album The South Park Psycho was released in 1992. There was no single to promote the album but it charted at #63 on the Top R&B/Hip-Hop Albums and sold almost 100,000 copies in the area to land him a deal with Priority Records. His second solo album Psychic Thoughts (Are What I Conceive) charted on the Billboard 200 at #151, at #30 on the Top R&B/Hip-Hop Albums and at #5 on the Top Heatseekers. His style of rap was hardcore gangsta rap with gory lyrical content, which is called horrorcore.^{[citation needed]}

After his 2003 album The Return!!! (of the Psychopath) NIP took a break before making a comeback with Still Psycho five years later. Ganxsta NIP’s most recent album, Psych' Swag: Da Horror Movie, consists of 14 songs and was released on the artist's own record label Psych Ward Entertainment.^[3]