“Nani!?” A Japanese word most commonly used in the English subtitled version of Anime. This word when translated to English means “what?”. The actors deliver this phrase with great bafflement in their voices.This word is very popular on the internet amongst anime watchers. In Japan it may just be a common phrase, however, it has become ubiquitous in the United States. There are many memes on the internet that use this word. Nani, a one word phrase, is common knowledge to all anime watchers in both the United States and Japan.
