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10.
A trekkie is a person who LOVES Star Trek. They may or may not dress as characters and go to conventions. They are sometimes just normal people who watch or read excessive amounts of Star Trek.
Trekkie1 "I just finished reading the whole Star Trek series"

Trekkie2 "No way! I just finished the movie series"

Trekkie3 "I just got back from a Klingon convention"
by Uhura September 28, 2012
 
1.
A devoted fan of the television series Star Trek or one of its spinoff series or films. Variant: Trekker
Jon is a major Trekkie.
by Tom E. Pinkerton November 18, 2002
 
2.
A fan of Star Trek, aka Trekker, Alhough Gene Roddenberry once mentioned that the only word he acknowledged was Trekkie. Trekkies are commonly known for their unique behavior often memorizing everything there is to know about Star Trek, going too conventions, having every Star Trek episode on VHS or DVD. Mainstream Media often pokes fun at them for being geeks, nerds, or just freaks.

Orgins:
The Term Trekkie can be seen in the novel "the great trek" by E.A. Walker, of course at this point it had no relation whatsoever to Star Trek.
More than 30 years ago, A Science Fiction editor by the name of Art Saha applied the word Trekkies to Star Trek fans when he saw a group of Star Trek fans wearing pointed ears at a Science Fiction convention.
The Trekkie walked into the Convention
by MSmith1988 January 05, 2006
 
3.
One who likes to watch Star Trek episodes and movies.
'Trekies' are usually initially hooked on to the Star Trek phenomenon by the intellectually stimulating issues covered in the different episodes.
by Tate Donovan May 24, 2004
 
4.
A fan of more than one Star Trek series, who may or may not necessarily dress up as characters or believe that it is real. The dressing up steryotype has been perpetuated by poor American cartoons and sad freaks who sicken even us other Trekkies.
Yes i'm a Trekkie, but i'm not a retarded nerd as well
by The Insane One November 12, 2003
 
5.
(n.) A fan, avid or otherwise, of at least one Star Trek series or movie. Devotees who totally immerse themselves in this subculture have given this term a somewhat negative stereotype, turning the majority of the fan base into the butt of many lame jokes. More "reality based" Trekkies, hoping to differentiate themselves from the habituous character-emulating, convention-attending crowd, choose to accept the label of "Trekker".
"John has the entire 3 seasons of the original Star Trek on DVD. What a Trekkie!"

"Nah... John's more of a Trekker. At least he doesn't go to half a dozen conventions a year dressed as a Klingon."
by fugitive247 October 29, 2004
 
6.
A fan of Star Trek. They try to own all of the series DVDs, buy all the merchandise they can, and attend all conventions possible. They enjoy watching Star Trek and hanging out with other trekkies. Surprisingly, most of them have lives and are very nice people.
The Trekkie is @ the 40th anniversary convention.
by TrekkieNotTrekker March 06, 2007