Well, since kj1980 posted about NicoNico douga maybe it'll be helpful to add some NicoNico douga lingo?
I highly suggest taking a look at
2ch lingo as well.
Some terminology / trends about NicoNico
(almost all of them do come from 2ch tho).
First, 弾幕
danmaku - roughly translates to Bullet Curtain.
This is when comments flood the screen.
For a good example, look up 組曲 on NicoNico.
The word
danmaku itself come from
Touhou Projects.
Calling someone a 職人
shokunin is a compliment on their skill.
自重
jijyuu is used to cation (often harshly) other people.
うｐ means upload. うｐ主 is uploader.
乙
otu = お疲れ様
Trends (this may not be worth posting...)
Spoiler:
Maybe too too specific for this thread...?
foo-san is a name you'll probably see a lot. When a douga is removed, the admins upload a douga in its place explaining the reason for removal. These douga are typically have foo-san (a staff member) playing a recorder flute in the background.
釣り (
tsuri) - phishing.
Videos on NicoNico that use titles and a cover pictures to bait people for something completely unrelated. A sub-examples are one with the ヌコヌコ動画 tags (ero bait -> kittens douga). /hidden is another example. 釣り also means the email phishing as well - but on NicoNico it means this.
組曲 (
kumikyoku) which translates to medley, however, on NicoNico this is almost always refers to the 『ニコニコ動画』 組曲.
Idol M@ster. This is pretty popular since their so much control over the movements of the idols then you can set them to a MAD/song. A specific lingo here is 閣下 (Her Excellency) which refers to the character Haruka. It's more of less the same with Nanoha's portrayal as the 管理局の白い悪魔 (The White Devil of the Administration) or her upgraded status of 冥王 (Lord of Darkness) - although Haruka's status is NicoNico born with a pretty vast 愚民 (ignorant denizen) cult following.
Mario specific terminology:
kj1980 mentioned this one above: 孔明 which is an ateji for 公明. The former is a Chinese military tactician. This specifically means the invisible block traps. The source for this is most likely a manga based off the Three Kingdoms (三国志).
Another Mario specific term is でっていう which refers to Yoshi. Original source is supposively a Life Card CM but it pretty much became universally popular with the Auto-Mario series.
Countless dougas are based off 東方Projects (Touhou Projects) which is a doujin shooting game credited for coming up with the word 弾幕. Aside the insane amount of 弾幕, Zun's music is wonderful and his characters are very moe~. His games are the bases of several IOSYS MADS whose MADS are in return the bases of countless other MADS on NicoNico.
Rockman (Japanese name for Megaman).
This is another great source for NicoNico MADs.
Two prime examples are the douga おっくせんまん and エアーマンが倒せない.
The latter is often a source for various parodies.
The former is the most sung song on NicoNico.