In this sense crackers is not food and not a Christmas toy. It is informal British English for crazy — the playful, everyday kind, not a doctor's word.

In this sense在這個意思下 crackerscrackers這個詞 is not food and not a Christmas toy不是食物，也不是聖誕節的玩具。It它 is informal British English for crazy是英式口語裡表示「瘋了」的說法——the playful, everyday kind是那種帶點玩笑、日常的瘋，not a doctor's word不是醫生用的正式術語。

You say it after be: he is crackers, that idea is crackers, you must be crackers to swim in this weather. It often sounds teasing rather than cruel, the way a friend says you have lost your mind.

You say it after be你會把它放在be動詞後面說：he is crackers他is crackers瘋了，that idea is crackers那個點子is crackers很瘋，you must be crackers to swim in this weather這種天氣還去游泳，你一定是crackers瘋了。It它 often sounds teasing rather than cruel聽起來常帶著調侃，而不是刻薄，the way a friend says you have lost your mind就像朋友說你腦子壞掉了那種語氣。

Older British speakers still use it; younger ones may prefer mad, nuts, or mental. Americans understand it from films more than they say it.

Older British speakers年紀較長的英國人 still use it仍然會用這個詞；younger ones年輕人 may prefer mad, nuts, or mental可能比較常用mad、nuts或mental。Americans美國人 understand it from films多半是從電影裡認識這個詞，more than they say it而不是自己會這樣說。

You will not often hear a crackers person in front of the noun; it likes to sit after the verb.

You will not often hear你不太會聽到 a crackers person把crackers放在名詞前面說成「a crackers person」；it它 likes to sit after the verb比較喜歡放在動詞後面。

The picture behind it is an old navy joke: that someone had firecrackers going off inside their head. First it was he's got the crackers, then he's gone crackers, and now he is crackers.

The picture behind it這個詞背後的畫面 is an old navy joke是海軍的一個老笑話：that someone had firecrackers going off inside their head說某人腦袋裡有鞭炮在炸開。First一開始 it was he's got the crackers說法是「he's got the crackers他有鞭炮」，then he's gone crackers後來變成「he's gone crackers他變crackers了」，and now he is crackers現在則是「he is crackers他is crackers」。