Meaning:

“说” means to “speak,” “人” means “human,” and “话” means “language.” In this digital era when technological innovations and new ideas pop up every day, many people, especially those in the high-tech industries and startup companies, like to use a lot of fancy words and jargon in conversation. Some have also coined new words or used existing words to express new ideas. Therefore, when people cannot understand technical jargon or fancy words, they will ask the speaker to “speak human language,” ie., to explain their ideas in simple everyday language.

Example:

A: 我抽样调查了用户痛点，比起阿司匹林，我们的产品可能更像是维生素。

Wǒ chōuyàng diàochá le yònghù tòngdiǎn ，bǐ qǐ āsīpǐlín ，wǒmen de chǎnpǐn kěnéng gèng xiàng shì wéishēngsù。

I polled some of our users to find out more about their needs. It turns out our product is more like vitamins than aspirin.

B: 说人话。

Shuōrénhuà。

Speak English.

A: 我们的产品可有可无。

Wǒmen de chǎnpǐn kěyǒu kěwú 。

Our product is nice to have but not a necessity.