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1.
1. A person who is overly obsessed and easily excited with the hit TV show, LOST.

2. A degree of fandom only attained by knowing way too much info about the show LOST.
"When I mentioned the Dharma Initiative, she was a total Lostie and knew everything about it!"
by SNLfanforever February 11, 2010
 
2.
1.The people who were on Oceanic 815 when it crashed. *Note: The people who were in the tail section of the plane are called "tailies"*

2.Someone who is completely obsessed with LOST.
1.Jim:Who is that guy ?
Sara:That's Dr.Jack Shephard, He's a lostie.

2.Johnny:Who is that girl? She knows everything there is to know about LOST!
Lucy: Oh, that's Lindsay. She's a total lostie!
by ElleDee March 30, 2008
 
3.
1.The people who were on Oceanic 815 when it crashed. *Note: The people who were in the tail section of the plane are called "tailies"*

2.Someone who is completely obsessed with LOST.
1.Jim:Who is that guy ?
Sara:That's Dr.Jack Shephard, He's a lostie.

2.Johnny:Who is that girl? She knows everything there is to know about LOST!
Lucy: Oh, that's Lindsay. She's a total lostie!
by LindsayDee April 01, 2008
 
4.
1. Someone who gets confused easily or unable to give reasons or explanations to something obvious or able.

2. It can also mean a person who mentions something then suddenly loses focus at what was being said or unable to cope or understand the situation or meaning.
I have a friend Rowena, she started talking about something then forgot what she was talking about, haha such a "lostie"
but then again she is very beautiful. and that makes up for it.lol
by m0oks March 04, 2008