An asocial person who lives amongst others, but avoids as much contact with them as possible.

a lurker is anyone who follows or partakes in something without actually contributing and/or participating in said activity. Lurkers can be found in any gathering of people, but the best place to find them is at a public skate park (one anyone can get into for free)they are easily identified by looking like they're minutes away from getting up and doing the most amazing trick you've ever seen, but upon further observation, they never actually do. The kids who seem to just sit there and talk about drugs, crime, or any other "Bad ass" activity also qualify as lurkers.

The people at the skatepark that sit and watch, but don't skate.

One who lurks, particularly online in chat mediums. Lurkers are fond of staying in the shadows like a spider but monitoring online chat activity all the while. Lurkers usually have a tendency to profess innocence of lurkdom, as well as offer excuses of supposed non-lurk activity when caught.

sneaking or stalking someone/thing;especially if you are a Zerg

People who hang at the skatepark and smoke weed all day instead of skating.

A player in Counter Strike which is not together with the team, he is in another location in the map trying to kill people from behind.