What does the Chinese idiom “big hands big feet” mean?

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Generally the word “大(dà)” means big.

Example

Wǒ tīngshuō Zhāng Wěi xǐhuan nàgè dà yǎnjīng de nǚháir. 我   听说        张        伟   喜欢    那个  大  眼睛     的 女孩儿。

I heard that Zhang Wei likes that girl who has big eyes.

However, on some occasions when the word “大(dà)” is combined with certain words, it can create words with new meanings, such as “大手大脚(dàshǒu dàjiǎo)” and “大嘴巴(dà zuǐba).”…