"Mannish Boy" (or "Manish Boy") is a blues standard by Muddy Waters first recorded in 1955. It is both an arrangement of and an "answer song" to Bo Diddley's "I'm a Man", which was in turn inspired by Waters' and Willie Dixon's "Hoochie Coochie Man", in first release it was titled "Manish Boy.""Mannish Boy" features a repeating stop-time figure on one chord throughout the song and is credited to Waters, Mel London, and Bo Diddley.