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Jyutping gon3 maa3
Pinyin gàn ma

Definitions (Wiktionary)
  1. verb, vulgar
    幹 (“to fuck”) + 嗎 (“question particle”)
  2. verb
    幹 (“to do”) + 嗎 (“question particle”)
    • 這事你幹嗎?
      这事你干吗?
      zhè shì nǐ gàn ma ?
      Will you do this?

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Jyutping gon3 maa3
Pinyin gàn má

Definitions (CC-CEDICT)
  1. see 幹嘛|干嘛[gan4 ma2]
Definitions (Wiktionary)
  1. verb, colloquial
    what is (someone) doing; what is going on
  2. verb, colloquial
    what is wrong; what is up
  3. adv, colloquial
    why; why on earth; whatever for
    (syn.) 擁啥, 做麼子, 為乜為物, 幾解, 作個乜, 做咋個, 何, 做啥子, 擁什麼, 蔣其, 作乜物, 為乜底, 為哪門, 為哪樣, 幹麼兒, 何解, 做孰事, 為咋哩, 因乜解究, 嗎介, 曷, 為啥, 因個乜, 為什乇, 做乜乇, 作乜, 胡為, 為麼, 做哪乇, 為嘛, 做事, 啥講究, 因何, 做啥, 做什麼, 因乜事幹, 幾何, 為乜, 為淡事幹, 做乜事幹, 為甚物, 妝乜, 介計, 為些哪樣, 為啥物, 因啥, 整乜嘢, 做麼, 為何呢, 何以, 為咋個, 做點高, 做什名, 奚, 做麼事, 仰解, 幹什麼, 怎作, 做乇, 因乜, 做乜, 緣何, 做咋哩, 為麼子, 為甚, 為什個, 為何, 做乜事, 為咩, 做呢, 為啥子, 為麼個, 敢咧, 幹乜勢, 為麼事, 做門, 為乜嘢, 為孰事, 是按怎, 幹嗎, 做物, 創甚物, 因乜嘢, 為甚們 formal, 咩, 乜頭路, 何故, 為物底, 為待西, 物代, 為乜事幹, 做咩, 做何, 為點高, 幹什, 何物事, 做乜計, 敢哪, 胡, 怎搞的, 怎搞, 為什哩, 乜, 做哪門, 做呢乇, 啥個講究, 傒勢, 點解, 啥體, 為乜事, 啥個路道, 啥個緣故, 蔣講, 甚們事, 𠰻們, 為什麼, 何為, 做什乇, 為麼兒, 做物事, 按怎, 為點啥, 為啥體, 因為甚, 因乜緣故, 做乜嘢, 做麼個, 敢哪誌
Definitions (HSK3.0)
  1. HSK3 三级词汇表 #223
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    爸爸,你在干吗?
    爸爸,你在幹嗎?
    bà ba , nǐ zài gàn má ?
    • What are you doing, Dad?
    • Dad, what are you doing?
  2. Mandarin
    你干吗不早点说?
    你幹嗎不早點説?
    nǐ gàn má bù zǎo diǎn shuō ?
    • Why didn't you say so earlier?
  3. Mandarin
    你已经知道答案了,还问我问题干吗?
    你已經知道答案了,還問我問題幹嗎?
    nǐ yǐ jīng zhī dào dá àn le , hái wèn wǒ wèn tí gàn má ?
    • Why are you asking if you know it all?
  4. Mandarin
    你觉得我在干吗呢?
    你覺得我在幹嗎呢?
    nǐ jué de wǒ zài gàn má ne ?
    • What do you think I was doing?
  5. Mandarin
    妳干吗不穿件连衣裙呢?
    妳幹嗎不穿件連衣裙呢?
    nǐ gàn má bù chuān jiàn lián yī qún ne ?
    • Why don't you wear a dress?
Examples (Wiktionary)
  1. Mandarin
    你干吗不喝点酒?
    你幹嗎不喝點酒?
    nǐ gàn má bù hē diǎn jiǔ ?
    • How come you don't wanna have a sip of alcohol?
  2. Mandarin
    干吗阴沉著脸?
    幹嗎陰沉著臉?
    gàn ma yīn chén zhe liǎn ?
    • Why so gloomy?
  3. Mandarin
    这事你干吗?
    這事你幹嗎?
    zhè shì nǐ gàn ma ?
    • Will you do this?