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1.
Someone who is incredibly sketchy, often referred to as "Stalker" that will climb endless amounts of stairs to peek into your bedroom at night. Sometimes someone who can read your mind and knows what you will say before you say it.
"I had a really weird dream last night and I woke up screaming."

"Ya I know."
STALKZ
by versusxh April 19, 2009
 
2.
Whenever you use Facebook or a similar site to stalk someone, and then use that information in a conversation with them online(AIM). Or use it to call them out on it.
Your birthday is next week right? -btw stalkz

hey, how'd u know that?
stalkzzzzz
by caust1c December 17, 2008