Definitions by MrBunny

man child 

A man with the character of a young child. Also could be a juvenile who is too young to be old, but too old to be young. An old soul trapped in the body of an adolescent. A man who is too old for babysitting, but desperately needs it.

plural: manchildren

"Her boyfriend, Darren, is a complete and total man child. I'd offer to babysit it, but it's kind of creepy."

man child by MrBunny January 4, 2012