socially dead

- A person who doesn't give a shit about other people, rarely talks to anyone in person (and does laconically if so), and often has only one or zero friends. May appear distant, aloof and unemotional to others. Although most of them are somewhat active on the internet, some socially dead people may have vanished completely from social media, or rarely leave their home other than for errands or appointments. Only opens up to people they really, really like, although one has to know how to access them the right way, and this is a hard process. They can seem intriguing and distant at first, but if they ever open up, they are often interesting, intelligent and beautiful souls. This behavior can sometimes be caused by traumatic life events, teenage angst, misanthropy, existential crisis, depression, severe anxiety, mental illness, or the person is just "that way". Main characteristic of Schizoid Personality Disorder. May or may not be asexual.

- Someone who is remarkably slow to reply to text messages due to being frequently offline or distracted, much to the extreme frustration of people who keep trying to talk to them.

also see schizoid, loner, lone wolf, hermit or hikikomori

Also known as SDE for short.

A person (usually a guy) who either a) has no friends, or b) shields his friends from others all the time. If you meet one of these people, you won't be making any "friends of friends" through them anytime soon, no matter how hard you try or how many years pass. If the SDE is dating someone steadily, you won't even know her name until after they break up.

A SDE will especially shield contacts of the opposite sex, even if they have no chance with them, for fear their friends will "steal their girl/guy". If they're in a steady relationship, they still shield because a) they're still afraid someone (including you) will try to steal her/him away, or b) the SO is nothing to be proud of (ie a fugly ditch pig or pork chop). When a SDE brings out a contact of the opposite sex, it's almost always an ex, or someone he/she tried and failed to get with. Meanwhile, the SDE will have no problem asking you to introduce more girls/guys to him/her regularly. If you do it's a one-way street.

If you are stuck in a social circle full of SDEs, you must find some non-SDEs on your own, as your friends sure as hell won't be helping in this department.

Engineers and Computer Programmers come to mind.