A person who is just "there." Nobody really knows why, other than they show up and don't say a word. Possible reasons for this could be:
-They don't know what to say
-They are pretending to have friends
-They are trying to scare you
-They are there just to be seen with you, as if they have some kind of relationship with you.
Person 1: Who's that?
Person 2: The lurker. He shows up everyday, just ignore him.
Anyone who keeps guitar picks, sugar packets, stink bombs, computer chips with viruses on them, a palm pilot, and fortune cookie fortunes in their pockets all at the same time.
Random person: "Yeah and I also have a stink bomb somewhere in here...Crap! Where'd it go?"
Normal person: "Wow. I'm leaving."