McKenzie Haynes (born March 24, 2005), better known by his stage name FattMack, is an American rapper from Mobile, Alabama.

FattMack is an emerging musical artist who began gaining widespread recognition in 2023. Known for his distinct sound and memorable & relatable tracks, including fan favorites like Yellow, Ashes, CBFW, Shit Change, Fullys, FattMack’s music blends catchy beats with raw, authentic lyrics that resonate with listeners. His style is characterized by a mix of trap, rap, and hip-hop influences, which have helped him carve out a unique space in the music industry. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.