迷你 is a loanword from English 'mini', used in Chinese as an attributive adjective meaning 'mini-sized' or 'tiny'. Unlike English, it often carries a playful or cute connotation, especially with clothing, pets, or gadgets. You place it before a noun to describe something deliberately small and often charming (迷你裙 'miniskirt', 迷你狗 'tiny dog', 迷你电脑 'mini computer'). It cannot stand alone as a predicate.