あいつもこいつもどいつも阿呆
aitsu mo koitsu mo doitsu mo ahou
Every single one of them is but a fool, 

チントンシャンでお祭り騒ぎ
chintonshan de omatsuri sawagi
making a ruckus as if it's a festival.

どんな言葉も右から左
donna kotoba mo migi kara hidari
Every word flows in at one ear and out at the other.

浮世は常に盛者必衰
ukiyo wa tsune ni joushahissui
The golden days of our lives will come to an end. 
{I liberalize ukiyo as normal life here}

つまらぬ戯言に流されて
tsumaranu tawagoto ni nagasarete
Having to deal with boring crap every day,
{liberalized nagasarete with ~dealing every day, since in this context it means it's part of his life}

金魚の糞に成り果てる
kingyo no fun ni narihateru
I feel like I've been reduced to a mere hanger-on.
{crap makes up for shit now, so I think this flows nice}

誰も彼もが口を揃え
dare mo kare mo ga kuchi wo soroe
Everyone opened up their mouths in unison,

罵詈雑言をへらへらと
barizougon wo hera hera to
swearing like there's no tomorrow.

縦も横にも並べ立てる
tate mo yoko ni mo narabetateru
Curse words filling up every corner of the room.
{lit. horizontal + vertical}

他人の不幸せを 嘲笑うことだけが
tanin no fushiawase wo azawarau koto dake ga
Uttering foolish things such as saying the reason of life

生き甲斐だなんて馬鹿なこと
ikigai da nante baka na koto
is just about ridiculing someone else's misfortune...

痛い痛い聞いちゃいられない
itai itai kiichairarenai
Stop it! I can't bear to hear it!

この世は、ヤッたもん勝ち イッたもん勝ち 
kono yo wa yatta mongachi itta mongachi
In this world, anyone who lost their virginity is a winner.
{liberal. Literally ones who have done it and ones who came (in sexual sense)}

乱痴気騒ぎ
ranchikisawagi
Just like an orgy.

がんがんと囃し立てる野次馬
gangan to hayashitateru yajiuma
With onlookers cheering loudly by the side.

いっそ口をつぐみ　みみをふさぎ
isso kuchi wo tsugumi mimi wo fusagi
I might as well shut my mouth, cover my ears

瞼を閉じて
mabuta wo tojite
and close my eyes.

知らぬ存ぜぬを通す
shiranu zonzenu wo toosu
Forcing myself to believe I know nothing about it.
{lit. pretend ignorance}

なんちゃって
nanchatte
As if.