Someone who has withdrawn from all real-life social interaction. A hikikomori rarely leaves their home, and has no friends or family with whom they interact. A hikikomori is NOT always an otaku, nerd, gamer, etc, though they can be.
Portmanteau of hikikomori ie.Japanese men who live solitary and socially isolated lives. and Marxist ie. Hating capitalism and investment in technological innovation. A person with no social life who wastes time online shitting on hyped technological innovations, sometimes rightly, often wrongly.
Person on twitter- "Our app broadcasts messages from one phone to another and you get a notification in the app"
Hikikomarxist - "twitter, You've invented twitter moron."
Person on twitter - "Don't generalise, innovation is always in the details, Also, fuck you, get a life hikikomarxist."