Otaku is rooted from the Japanese word オタク and can be used in many different ways the most common is refers to someone who is obsessed with Japanese culture specifically in Manga, Anime, Cosplay and such, The Japanese definition of Otaku is a nerd or weirdo.
"Gosh, Miranda Sings is such an otaku she is always watching some form of Anime."
"Look at him he is such an Otaku always playing with Pokemon trading cards."
"Look at him he is such an Otaku always playing with Pokemon trading cards."
by Ihatetofu March 07, 2017