For online slang, it means "SHIT! My Goddamn parents are behind me! SHIT... DON'T CURSE GODDAMNIT!"
AIM (AOL Instant Messenger)
WarDevil3333 : Crap, lurkers are here.
GregVa89 : Oh, ok. Hello Mr. and Mrs. Devil, I love your son. he is so handsome.
by Alex and Greg April 6, 2003
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Someone that, when you're trying to do something you don't want other people seeing, always seems to walk in and/or be hanging arround, preventing you from doing said thing.

Such people are often buzzkill and don't realise it.
Man, everytime my girlfriend and I try to make out, we keep getting a lurker.

Sorry dude, I can't click on that page; I have a lurker.
by Anonymous December 24, 2004
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Annoying people that never reveal their online presence when using IM software, preferring instead to appear AFK, or not there at all.
Andy: Is Carl on YIM? I want to tell him I'm sleeping in his spare room this weekend.
Me: No idea, the lurker's not on my list.
by Digital Shaman April 21, 2005
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A person who didn't get an invite to a keggar who hangs around outside the property line on his KMart skateboard hoping some Humboldt Nuggets will fall out of someones pocket for a ground score.
Spacin Jason is such a Lurker you can't get rid of him and his Boy/Girlfriend 'Fast' Eddy Cocks with a rifle shot over the head.
by blacky9er#7 November 26, 2013
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someone (like f99molina) who quietly watches the soap opera of collegiate message forums unfolds to be kept up to date and on point with anyone and everyone.
"Keep your mouth shut before that lurker burns you"
by anti-lurker May 20, 2003
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Someone who looks at people's myspaces without that person knowing. They might be a friend or someone whos profile isnt private.
Jimmy - My mom lurked you last night!
Tom - What a lurker!
by jimmehlong September 27, 2007
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