What is the translation of "嘯いている内容は？" in English?

The phrase "嘯いている内容は？" translates colloquially to: "What’s the content they’re shouting about?"

What does the word "嘯いている" mean in this context?

In this phrase, "嘯いている" (pronounced sōiteiru) means: shouting / yelling (in a dramatic or exaggerated way)

In this phrase, "内容" (pronounced naiyō) means: content / what is being said

In this phrase, "は" (pronounced wa) means: topic marker / subject particle

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