懐古かいこ Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb reminiscence;nostalgia;thinking fondly of the past;recalling the old days
懐古厨かいこちゅう Noun English jmdict 1 noun (common) (futsuumeishi) Internet slang derogatory nostalgic person;person who prefers the good old days;fuddy-duddy