This is the 16325th most frequent Korean word.
비속어로
"비속어로" means "in slang" or "in vulgar language" in English.
In this sentence, '비속어로' indicates that slang language is being used to make a joke.
그는 비속어로 친구에게 농담을 했다.
He joked with his friend using slang.
Here, '비속어로' refers to the undesired use of informal or unpolished expressions.
비속어로 말하는 것은 예의에 어긋나요.
Speaking in slang terms is against good manners.
In this context, '비속어로' describes how the piece of writing was phrased, emphasizing the informal or vulgar choice of words.