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This is the word you reach for when the real word has fallen out of your head. You are pointing at an object, everyone can see it, but the name will not come — so you say "pass me the whatchamacallit" and wave your hand at it. It is a placeholder, a word-shaped hole. It is used for things, not usually for people, and it is completely informal — the sound of ordinary talk at home or with friends, not something you write in an essay. It is long and funny to say, which is part of why people like it; saying it is a small joke at your own expense. There is a whole family of these in English and they are : thingy, thingamajig, thingamabob, doohickey, , whatchamacallit. Some are more American, some more British, but any of them will be understood. It works best when the listener can see or guess what you mean — if they cannot, they will just say "the what?"
那個…那個什麼來著、那個叫什麼的東西（想不起名字時的替代詞）
組成It is the whole sentence "what you may call it" squashed into one word — what-you-may-call-it → whatchamacallit. First recorded in America in 1921. Once you hear the original sentence inside it, the spelling stops looking random.
同家族的字
- whatsitthe same trick, shorter: "what is it" squashed into one word
- thingamajignot the same pieces, but the same job — a stand-in name for a thing you cannot name
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。
whatchamacallitnoun/ˈwɒtʃəməˌkɔːlɪt/
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A metasyntactic term used for any object whose actual name the speaker does not know or cannot remember; a doodad, gizmo, thingamajig, thingy.
- The Thingamajig and the Wachamacallit.
- You’re—you must be the whatchamacallit, huh? The peer.
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。