Context: a manbagyaru sees the main character, who has cat allergy, talking to cats, a stream of Niconico-style comments appear out of nowhere, likely representing her thoughts.
It's worth noting that her first person pronoun is atashi あたし, and one of the comments uses a different first person pronoun, indicating that the comments weren't written by herself.
The text speed is obviously too fast to read without pausing. It makes sense all comments are displayed for the same length of time, equally, which means longer comments move sideways faster than shorter ones.
neko ni norowareta-n-daro www 猫に呪われたんだろｗｗｗ [He] was cursed by cats, [I bet], lol. (passive voice.)
↑ neeyo wwwww ↑ ねえよｗｗｗｗｗ Not! lol No, he was not! lol (this is a comment by a different user who likely replayed the video to make their comment line up with the other comment.)
neko ねこ Cat.
zawazawa...... ざわざわ･･････ *sound effect for an anxious situation, likely a parody to Kaiji.*
Phrase used when something awaited finally happens. Often used like this, as a meme, around the internet, sometimes even including this exact kaomoji 顔文字..
{neko-zuki na} oreni wa {tamaranai} shichu www, kawatte-kure wwww 猫好きな俺にはたまらないシチュｗｗｗ代わってくれｗｗｗｗ For me [who] {likes cats} [it] is an {irresistible} situation www, please switch with [me] wwww.
tamaranai - something you can't get enough of, favorite, irresistible, negative form of tamaru たまる, "to stock up," "to fill up."
Σ(ﾟДﾟ＂) A shocked kaomoji, used when something is sugoi すごい for example.
{itsuka yaru} to omotta w いつかやると思ったｗ [I] thought that {[he] would do [it] sometime}. (literally.) I had a feeling he would do something like this one day.
itsuka - itsu いつ, "when," interrogative pronoun followed by the ka か particle.
In the sense of "wait, what are you doing, stahp."
Kousaka w neko to ww ohanashi tte... 高坂ｗ猫とｗｗお話しって･･･ Kousaka w, talking ww with cats [is]...
{arerugii da} nante itterukedo, hontou wa neko ga dai-suki na none w アレルギーだなんて言ってるけど、本当は猫が大好きなのねｗ [He] [keeps] saying {[he] is allergic}, but the truth is [he] loves cats, [doesn't he]? lol
