What is "man child"

alt. 1 (context archaic English) A young male human; a boy. 2 (context colloquial generally derogatory English) An adult male considered childish or immature. 3 (context colloquial English) ''of a boy or young male teenager, particularly an athlete'': being physically large or tall, having the physical appearance of an adult male. n. 1 (context archaic English) A young male human; a boy. 2 (context colloquial generally derogatory English) An adult male considered childish or immature. 3 (context colloquial English) ''of a boy or young male teenager, particularly an athlete'': being physically large or tall, having the physical appearance of an adult male.