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A pillock is a very stupid person — a rude British insult, closer to idiot than to a light joke. You hear it in the UK when someone is : people say it about a friend who has done something daft, or about themselves after a mistake. It is informal and a bit rough, but it is not the strongest street swear; still, you would not say it to a teacher, a stranger, or in a polite email. Americans mostly do not use it, so it can sound very British. Though actually, the history is ruder than the school meaning: in the 1500s the word meant a man's penis. That is probably why it became an insult, the same way some other body-word insults did. Students only need the “stupid person” meaning for real life; just know it is not a kind word and not a classroom word.
笨蛋、白痴（英國口語罵人，不是課堂用語）
組成In the 1500s it meant “penis.” It probably comes from pillicock, an old word for that body part (and sometimes for a boy or man), and later shifted into “fool.” Another idea is a penis-word plus the little-ending -ock. Scholars are not fully sure which path is right.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
pillocknoun
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derogatoryslangA stupid or annoying person; a simpleton; a fool.
- What is it now, you great pillock?
- Take your Typhoon up there and swat the annoying mosquito out of the sky by challenging the infantile pillock to a classic World-War-II-era dogfight like a real man, to show them who the real king of European airspace is.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。