Colloquial expression; informal words or phrases used in everyday speech or within particular groups (similar to slang).
若者の間には独特の俗語がたくさんある。
There are many unique slang expressions among young people.
辞書には載らない俗語も多く、意味は文脈で判断する必要がある。
Many colloquial expressions don't appear in dictionaries and you need to judge their meaning from context.
テレビで放送する際は下品な俗語を避けることが多い。
On TV, vulgar slang is often avoided.