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1.
One who fills two requirements:
1. Participates in plays and musicals, either by acting, stage managing, joining tech crew or doing other technical work.
2. Enjoys the viewing and reading of plays and musicals.

This is not to be confused with a theatre snob, who only fills the second requirement.
That theatre geek tried out for The Crucible after he had seen it twice.
by J077 June 04, 2006
 
2.
A theatre geek is a person who acts and sings everywhere they go, because any sentence reminds them of a musical. They're usually extremely hyper because they chug down coffee and Monster before rehearsals to stay awake. They are very good at memorizing things because they have to memorize monologues. They are usually in their school's choir, musical productions, and plays. True theatre kids don't limit themselves to acting and singing in just those shows, and usually do shows in community theater as well. They are loud and obnoxious and they don't care what you think about them. They get along with pretty much everyone but some dislike jocks greatly. They spend their time looking up new musicals/plays, learning songs/monologues, and thinking of what the next show is going to be for them and who they think would be cast as whatever. They usually get pissed off if you don't know your lines by Tech week, or 'Heck Week', 'Hell Week', or even 'Heaven Week'. Tech Week is the week where you finally use tech equipment, and the rehearsals last about 5 hours. They usually try to stay optimistic and are actually quite horny people. Yet, they never find anything sexual about getting dressed in front of the opposite sex. Their pet peeve is when people who have no talent become famous (cough cough Rebecca Black cough) and they are always busy from going to rehearsals and cast parties. Don't mess with them or you'll die.
In general, they are outstanding people.
Person: Wow! Look at those hills!
Theatre Geek: *singing* The Hills are alive....with the sound of music...

Theater Geek: Hey! Learn your lines already or I'll say them! God! Don't come back to this theatre troupe next year!
Kid who didn't know lines: Bitch...

Asshole: HEYY DIRECTOR! THEY PUSHED ME OFF THE STAGE!
Theatre kid: He was making fun of us, it's what he gets.

Theater Geek 1: Ready for Tech Week? I'm not.
Theater Geek 2: Are you kidding?! I'm so excited!!!!!!

Average 11 yr old kid: Wow, Big Time Rush sure is amazing!
11 yr old Theatre Kid: They suck, I should be singing on TV.
by Proud_theatre_geek August 19, 2011
 
3.
A theatre geek is a person who is in theatre, knows everything about theatre, and is one of the most awesome kinds of people to live.
I love theatre geeks
your such a theatre geek awesome Emily kid ninja
by !emmyjawesome January 08, 2010
 
4.
A (usually high school) student who performs in plays or does technical theatre work. Originally a term of derision (see definitions below), "theatre geek" has now been co-opted by theatre geeks.
You untimely ripp'd me from my theatre geek poker game to show me this crap? Shuffle off out of my face.
by sesamekinjiru January 27, 2005
 
5.
1) A proud few who dwell in the bowels of their high school auditorium and survive off of stale bagels and way too many tacos from Jack in the Box.

2) People who realize the correct spelling of the word "theatre when referring to the Theatrical arts.
1) Did you see Josh? He is a total Theatre Geek! He can't hang out with us because he is always at rehearsal!

2) After Elle cussed out the newspaper editor for misspelling "theatre" everyone believes her when she says she is a Theatre Geek!
by Joseph318269 January 22, 2011
 
6.
a theatre major that thinks she/he is better than everyone else who isn't a theatre major
I went to the play and a bunch of theatre geeks were looking at me as if I wasn't supposed to be there.
by Di Di Mau Johnso May 09, 2001