ANH = Star Wars: A New Hope
* AO3 = Archive of Our Own, fanfiction archive created/maintained by the OTW
* AOS =
1. “Alternate Original Series” (Star Trek reboot movies).
2. TV series Marvel's Agents of S.H.I.E.L.D.
3. Age of Sail (Horatio Hornblower, Aubrey/Maturin, etc.)
* ATG = Any Two Guys, more rarely Any Two Girls. In reference to fic with generic characterization; the pairing could be “any two guys.” Used in "Guess the ATG" game threads (beloved of nonnies for the creative name-swapping possibilities).
* BEC = (look at that) Bitch Eating Crackers, referring to a grudge that makes the bearer annoyed by even the most innocuous actions of the target
* BFE = Bangs Fests Exchanges, one of meme's common threads
* BNF = Big Name Fan
* BL = boys' love
* BTS = a K-pop boy band, also known as Bangtan Boys
* BtVS = Buffy the Vampire Slayer
* CBT = on FFA, equally likely to be earnestly used in discussions about therapy options (Cognitive Behavioral Therapy) or in discussions about kink (Cock and Ball Torture).
* CEBLA = Chris Evans' Butthole Loving Anon
* CTSC = comment(ing) to see comments. No longer a thing since the move to Dreamwidth.
* DCU - DC Comics Cinematic Universe
* DD = “Details, details!” A call for evasive/coy nonnies to spill the beans about whatever.
* DW = Usually either Doctor Who or Dreamwidth; depends on context
* DFRW = Dog Fuck Rape World
* EFRW = Eldritchfuck Roseworld, a loose multiverse of Homestuck AUs.
* EFW = existential flame war, based on the LJ comm of the same name, which originated in the Usenet group alt.callahans. Enjoyed by some, reviled by others.
* FMA = Full Metal Alchemist
* FFN, FF.net, FF, variants = FanFiction.net
* FWA = Fog Warriors Anon, Dragon Age troll
* GoT = Game of Thrones, TV series based on George R.R. Martin's A Song of Ice and Fire (ASOIAF).
* GotG = Guardians of the Galaxy
* GSN = Grumpy Sutcliff Nonnies
* HIMYM = How I Met Your Mother
* HPMOR = “Harry Potter and the Methods of Rationality,” a smug longfic by “rationalist” cultist Eliezer Yudkowsky
* HTGAWM = How to Get Away with Murder
* ITT = in this thread
* JGY = Jin Guang Yao, a character in The Untamed. Sometimes pronounced “Jiggy” by Western fans.
* LJ = LiveJournal
* LJW = Lan Wangji, a character in The Untamed
* LL = “Link links!” (unless you're an spnanonhaven/FFA bimemer, in which case it stands for “Leonidaslion”)
* MCU = Marvel Cinematic Universe. Includes (at least) the Thor, Avengers, Iron Man, and Captain America movies, as well as the Agents of S.H.I.E.L.D. TV series in its continuity.
* MDZS = Mó Dào Zǔ Shī/Grandmasters of Demonic Cultivation
* MFVW/MFCW = Mantis Fuck Vore [or Consent] World, an FFA-originated offshoot of DFRW/A/B/O.
* MLP, MLP:FiM = My Little Pony: Friendship is Magic. Meme critter Pinkie Pie either hails from there or named herself after one of the characters.
* MNF = Medium Name Fan
* MSF = Migratory Slash Fan[dom]. Refers to fandoms transiently popular with certain, particularly big-name slash fans, often with white-cock juggernaut pairings.
* NFHA = Nathan Fillion Hating Anon
* NN = author Naomi Novik aka BNF Astolat, cofounder of OTW. Formerly, often referred to by her initials to avoid linking her wallet name to her fannish pseud; now that she has herself connected the two identities and also personally and publicly accepted a Hugo Award on behalf of AO3, there's no reason not to do so.
* NNF = No Name Fan. Very rarely also LNF, Little/Low Name Fan.
* OAA = Overly Aggressive Anon
* OEA = Overly Earnest Anon
* OLA = Overly Literal Anon
* OSA = Overly Sensitive Anon
* OMD = Original Male Dog
* OTW = Organization for Transformative Works
* OUAT = Once Upon a Time. TV show based on fairytales, on which step-grandparent/step-grandchild incest is not intergenerational and a major pairing.
* POI = Person of Interest. TV show/MSF starring Michael Emerson from Lost and Jim Caviezel a.k.a. JesusCavesus
* PWP = Porn Without Plot, also known as “Plot? What Plot?”
* RPF, RPS = Real-Person Fic, Real-Person Slash
* SJ, SJW = social justice, social justice warrior.
* SnK/AoT = Shingeki no Kyojin/Attack on Titan, popular manga/anime series
* STID, ST:ID = Not in fact a sexually transmitted ailment, but Star Trek: Into Darkness (the 2013 movie, second in the ST:AOS continuity)
* SVSSS = Scum Villain's Self-Saving System
* SW: TFA = Star Wars: The Force Awakens. Often just “TFA.”
* TGCF = Tian Guan Ci Fu/Heaven's Official Blessing
* TLJ = Star Wars: The Last Jedi
* TMA = The Magnus Archives, a horror podcast
* TOS = Star Trek: The Original Series
* TSN = On FFA, usually refers to The Social Network (2010 slashbait film), more rarely to The Sentinel (1990s slashbait TV series)
* TW =
1. Teen Wolf.
2. Torchwood.
3. Trigger warning. Depends on context.
* TYWAU = Things You Wouldn't Admit Unanon. One of the common threads on the meme, usually on the first page. Occasionally rendered as “TYWNAU.”
* WKX = Wen Ke Xing, a character in Word of Honor/Faraway Wanderers
* WS = He who shall not be named, for he is a notorious self-googler and will show up to act out on meme.
* WSA = Weird Scenario Anon. Just what it says on the tin.
* WSJ = On meme, normally Weekly Shounen Jump, a major manga magazine, rather than the Wall Street Journal.
* WTNV = Welcome to Night Vale, a podcast
* WTNVNA = Welcome to Night Vale Hating Anon, a long-time troll
* WWX = Wei Wuxian, a character in The Untamed
* YKINMKATOK = Your Kink Is Not My Kink And That's OK. Nonnies usually call this concept KINKTOMATO instead, as it's snappier and easier to remember.
* ZSS** = Zhou Zi Shu, a character in Word of Honor/Faraway Wanderers
(Some content cribbed from FFA's profile page. For some concepts mentioned on this page, there may be more information at Fanlore.org.)