FattMack
American rapper
FattMack (McKenzie Haynes) is a rapper from Mobile, Alabama, known for albums including Here to Stay, Untreated Trauma and McKenzie. He posts as fattmack_ on Instagram and as fattmack223 on TikTok, where his account is verified, and releases music on YouTube, SoundCloud and Spotify.
Career
He began releasing music on SoundCloud as a teenager, starting with Rookie of the Year in 2020 and The Villain in 2021, followed by several self-released projects. In 2024 he signed with Great Day Records and Santa Anna, releasing TMK that year and Here to Stay and Untreated Trauma in 2025; the latter includes "White Lies" with G Herbo. SoundCloud named him to its 2025 Ascending class.
According to his tour promoter, he opened for YoungBoy Never Broke Again on a 2025 tour date. His album McKenzie was released in December 2025 and expanded as McKenzie 2.0 in 2026, and Mr. Did It By Hisself 3, with guests including Polo G, followed in August 2026.
FattMack’s social media accounts
1 external identifier
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