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TFiOS - "The Fault in Our Stars". This is a book by John Green that is supposed to come out January 10th, 2012. The name of the book was suggested by one of the nerdfighters, and is inspired by Shakespeare's "Julius Caesar": "The fault, dear Brutus, is not in our stars, but in ourselves, that we are underlings".
Have you pre-ordered TFiOS?
TFiOS by Frenzicious July 28, 2011
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The abbreviation for The Fault in our Stars, a young adult fiction novel written by the most genius author John Green, released in January of 2012, a well-written book about two teenage cancer victims who think sarcastically and deeply, that fall in love. Stayed at #1 on the New York Times Bestseller List for 7 consecutive weeks, thanks in part to John and his brother, Hank Green 's large following on youtube, Nerdfighters.
"Hey, did you get your copy of TFioS yet?"
"Yeah, It's so good! Equal parts crying and laughing."
"DFTBA"
TFioS by NerdySmurf June 30, 2012
Related Words
An unimaginative term since Tifosi1 and Tifosi2 were already taken.

An obsessed Schumacher fanatic who is quite possibly mentally ill and in dire need of medical help.

Will use deranged logic and imaginary facts to proclaim that any F1 driver with the surname Schumacher is unconditionally better than everyone in all circumstances.
Who cares what Tifosi3 says about this, his opinion means nothing, who is he?
Tifosi3 by Tifosi1 February 29, 2004
Italian word for "fans", not necessarily hardcore.

The hardcore fans are called ultras.

The singular of tifosi is tifoso.
My mates are Juventus tifosi, but they're not ultras
tifosi by bjps May 17, 2008
fans, in Italian. Not hooligans. Does not exclude hooligans any more than "fans" in English does, but that's all it means: fans. Hooligans in Italian are "ultras," who do indeed often have strong political leanings to the right (Lazio ultras being the classic example). If "ultras" with strong political leanings to the left exist, it must be in a parallel universe ...
Antonio: ciao Vincenzo, Francesca, state tornando dalla partita?
Vincenzo: si', sai che siamo grandi tifosi della squadra, ma adesso dobbiamo fare la spesa per la mamma, e poi facciamo i compiti come i bravi ragazzi che siamo!

Translation: ciao Vincenzo, Francesco, are you coming back from the match?
Vicenzo: yes, you know we're huge tifosi of the team, but now we have to do the shopping for mamma and then we're going to do our homework like the good kids we are!
tifosi by watchafallingknife May 17, 2008

Triosmut 

A type of fanfiction peculiar to the Harry Potter fandom, involving a sexual relationship between all three members of the "Trio" -- the three main characters of the books.

Any story concentrating on sex or sexual activity/innuendo involving Harry, Ron, and Hermione.
She read a piece of Triosmut last night.
Triosmut by travelkitty December 7, 2006

mcnage a trios 

Similar to the mcgangbang (a McDonald's double cheese burger with a Mcchicken sandwich in the middle). Mcnage a trios is two Mcchicken sandwiches with a cheese burger in the middle. 2 chicks on each side of the meat.
Hey Frank, is that a Mcgangbang? No Ricky, it's a goddamn mcnage a trios, and the mother fucker is nice.