Slang
noun, の adjective
Vulgar language isn't necessarily bad words, or something like that. It's just rougher and not as standard as standard language. It is slang.
俗語 is a formal term for slang, often used in writing. If you want to talk about "slang" more casually, you'd simply say スラング.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
この俗語はアメリカ独特の表現です。
This colloquialism is an expression unique to America.
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