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Gaydar is an informal, word for a person's feeling that they can tell whether a man they meet or see is gay — sexually attracted to people of the same sex — without being told, and without already knowing facts about him. It is built to sound like a machine that picks up a signal. People say my gaydar is going off when they have that hunch. It is slang, used in casual talk and comedy, not in serious writing. Though actually, the tidy joke — that you can just know — is messier than it sounds. Clothes, voice, and manner are not a test, and plenty of people are read . Some speakers also stretch it to anyone, not only men, even though the older joke was about men. Use it lightly, and never as a way to out someone or to tease.
同志雷達（口語玩笑，不是真的儀器）
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。
gaydarnoun/ˈɡeɪdɑː/
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The supposed ability to detect whether or not a person is gay by observing that person's appearance, mannerisms, etc.
- This is not your Hallmark in Ames, Iowa. And there is “family” working there … no radar like gaydar, I always say.
- When you first come out, you might have an overactive gaydar. When I realized I was gay, I wanted everyone to be gay too, which led to a lot of wishful thinking. "Helen Hunt is gay!" Dream on, girl!
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。