Otaku (おたく/오타쿠) is a Japanese term for people with obsessive interests, commonly the anime/manga fandom. Depending on where you are, it can be a negative term, but I'm going to teach you a playful Korean term based off of this word!
This version of the word is usually used jokingly and means no harm :)
In Korean the sound "OH" (오) as in "OHtaku" means "5"
(Think of it as 5-taku)
The Korean sound "SHIP" means "10"
In order to call someone a SUPER OTAKU, an OTAKU x2, or someone who is all-knowing and really REALLY into something...
You call them...