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1.
Someone who really likes the musical Rent. Usually found "rushing" (waiting outside for hours) to get $20 front row tickets. Many have seen the show hundreds, even thousands, of times.
"Those Rentheads in the front row can get pretty annoying with all their whooping and hollering between songs."

"I'm a total Renthead! I know every word to RENT!"
by Kristen October 20, 2003
 
2.
A disciple of the late, great, Jonathan Larson. About half of these Rentheads aren't really Rentheads, but they saw the movie and apparently that's enough. Someone who is completely in love with the show, almost as much as I am. We know the beginning to I'll Cover You isn't "Cold", "Come on", it's "Alone at last..." "...Darling, we're everything", and Take Me or Leave Me belongs in Joanne's loft, not the Greenwich Village Country Club.
True Rentheads are one in 525600.
by Vampire Welfare Queen December 06, 2006
 
3.
A group of loyal followers (obsessed fans) of the Johnathon Larson musical, RENT. Possess the ability to quote lines of the play instantaneously, sing through the entire soundtrack without stopping, and name every member of the original cast without blinking.
Theater Kid 1: Oh my god Johnathon Larson was a fucking genius!

Theater Kid 2: Seasons of love is the best song ever written...ever.

Theater Kid 1: I concur.

Normal Kid: God, you guys are such rent-heads.
by La Femme Boehme May 23, 2006
 
4.
Someone who is obsessed with RENT. They know every word to every song, have seen BOTH the movie and the play, and love it to death. They know every little detail, from the fact that 'Take Me Or Leave Me' was added two rehearsals before show time, to the precise differences between the Movie and Stage show.
Forrest is such a RENThead, He knows all the words, facts, and little everythings about RENT.

RENTheads, gosh, get a life, RENT isn't something to obsess about. Just because YOU know everything about it, doesn't mean we do.
by Forrest/Remus November 03, 2007
 
5.
A disciple of the late, great, Jonathan Larson. About half of these Rentheads aren't really Rentheads, but they saw the movie and apparently that's enough. Someone who is completely in love with the show, almost as much as I am. We know the beginning to I'll Cover You isn't "Cold", "Come on", it's "Alone at last..." "...Darling, we're everything", and Take Me or Leave Me belongs in Joanne's loft, not the Greenwich Village Country Club.
True Rentheads are one in 525600.
by Vampire Welfare Queen December 06, 2006
 
6.
group for those obsessed with Jonathon Larson's RENT. Known to frequently talk about how horrible the movie was, quote the show, listen to the soundtrack for hours on end, and break into song. May write fanfiction about the characters, and often relates everything and anything back to Rent.
Non-Rent-Head1: I love Ben and Jerry's icecream!
Non-Rent-Head2: Me too! I like all the cows on the logo...
Rent-Head: Cow? Moo? MOO WITH ME! Only thing to do is jump over the moon!

or

Non-Rent-Head: Oh, crud, the power's out!
Rent-Head: LIKE WITH MARK AND ROGER! OMG!
by Ironic. September 15, 2009
 
7.
Fans and followers of the musical RENT by Jonathan Larson. Someone who loves the music of RENT. A fan who camped out side of the theatre for 20 dollar seat when RENT first opened in New York.
Kay: *sings* "525,600 minutes, 525,600 seasons of love..."
Mark: "You are such a renthead!"

Kay: "I camped outside of New York Theatre Workshop to see RENT for $20."
MArk: "You are a renthead!"
by Mimi Brown December 22, 2011