カス in the context of 俺はやる lyrics by Wanyudo


I can't figure out the meaning of the chorus from the song
[俺はやる](https://open.spotify.com/album/6fOCGZWnxLM470jA03azno) by Wanyudo.
Particularly I have a problem with the word カス.

The context is as follows (someone transcribed the full lyrics
[here](https://pay-
design.net/01/2019/05/27/%e8%bc%aa%e5%85%a5%e9%81%93-%e4%bf%ba%e3%81%af%e3%82%84%e3%82%8b-%e3%83%95%e3%83%aa%e3%83%bc%e3%82%b9%e3%82%bf%e3%82%a4%e3%83%ab%e3%83%80%e3%83%b3%e3%82%b8%e3%83%a7%e3%83%b3%e5%85%a5/#comment-122813),
the link contains also a live performance of this song without the need for
Spotify account):

> 口だけのカス朽ち果てろよ  
>  こんな奴が相手じゃ誰も付き合えんよな  
>  期待を裏切り嘘をつき人の道に背き  
>  偽善者の人見知り繁華街のごろつき  
>  ...  
>  俺はやる やりたいやらなくちゃそれはカス  
>  俺はやる 必ず俺はやる声枯らす  
>  俺はやる やりたいやらなくちゃそれはカス  
>  俺はやる 必ず俺はやる声枯らす

From the first phrase (口だけのカス) I guess カス is a noun and it might be used in
the fifth meaning here: [dregs (e.g. of society); scum;
dross](https://jisho.org/search/%E3%82%AB%E3%82%B9) (and etymologically coming
from カストリ文化) for someone who lives only from "their mouth", i.e. this rapper.

I imagine the first line (口だけのカス朽ち果てろよ) is something that he hears (from
imperative form of 朽ち果てろ) and the meaning of what follows and the chorus would
be an answer to it - something like " _this is how I live, this is the way of
カス_."

Is my interpretation correct?




口だけ(の/だ) is a phrase used to mean "all talk", as in someone who talks big, but
doesn't ever do anything they say they will.

So 口だけのカス means "pieces of s**t who are all talk".




口だけ(の/だ) is a phrase used to mean "all talk", as in someone who talks big, but
doesn't ever do anything they say they will.

So 口だけのカス means "pieces of s**t who are all talk".

