> ここすき and its variants
You may think about these phrase: "ここすき" (koko suki, I like this point), "ん?" (n?, what?), "ファッ!?" (Fa!?, eh?), "流れ変わったな" (Nagare Kawattana, It has changed mood), etc…
Those phrases are collectively-referred to as "Inmuana" (淫夢語録, Inmu Goroku) or just "Anas" (語録, Goroku) for short.
As I said before, those are nothing more than a meaningless argot. Inmfags just enjoy posting the same comments at the same timing.
> 33-4
"33-4" is a total score in a previous Japanese professional baseball championships. That is an in-joke for one-sided situations in 2channel's /livejupiter/ board. Since /livejupiter/'s cultural climate is deeply influenced by Inmu phenomena, there are many common jargons in both communes.
> やったぜ。 (Yattaze, did it.)
It comes from the title of a kinky post of middle-aged men's homo scatology sex in an online forum. This phrase is also included in the Goroku.
> what other type of videos Inmufags commented at?
Anything caught an attention from Inmufags. Attracting the attention of Inmufags is likened to "harmful rumor". (風評被害, Huuhyoo Higai). A wiki page for Inmu lists up dozens of topics suffered harmful rumor from Inmufags. However, most of them are just cavils.
> OtoMADs with music other than common songs
Mainly, OtoMADs videos are made by remixing a "popular" phrase sampling from TV anime or something and a "popular" musical resource by a "popular" editing style. So every vocal resources for MADs could be called as commonplace. And that's what MAD editors love to use. In other words, MAD editors only use something popular/trending in each periods for their works.
> Cyclops Senpai
Visual resource: another gay porn video starring Yaju Senpai
Musical resource: Sandstorm by DJ Darude
It would be better to post an article rather than explaining in here. Please give me some time to write up.
> Bemani
Hmm, I don't know much about it. But the common feature of popular musical resources for OtoMAD are high-speed beats and changing the movements several times in a short time. Ryu's bemani songs may fit to that demands.
Of course, musical experiences of OtoMAD editors must be poor, since they listen to music via TV animes or video games only :(