Zài yǒuxiē fāngyán lǐ, nǎizi jiùshì niúnǎi de yìsi.
In some dialects, 奶子 just means milk.
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In standard Mandarin, 奶子 is crude slang for breasts. The polite term is 胸 (xiōng) or 乳房 (rǔfáng). In some northern dialects, it innocently means 'milk.'
