씹덕

A hardcore anime/manga obsessive — someone so deep into otaku culture it's almost unhinged. From 씹 (an intensifier prefix, vulgar) + 덕 (shortened from 덕후, Korean adaptation of "otaku"). More extreme than just being a fan; this person has fully surrendered to the culture.

씹 = vulgar intensifier prefix (roughly "ultra-" or "hard-core")

덕 = fan, otaku (shortened from '덕'후, Korean pronunciation of "otaku")