When communicating in Chinese you may often make mistakes using Chinese grammar like:

False:

    小王你别着急，咱们等你。

    Xiǎowáng nǐ bié zháojí, zánmen děng nǐ

True:

    小王你别着急，我们等你。

    Xiǎowáng nǐ bié zháojí, wǒ men děng nǐ.

“咱们”包括谈话的对方即小王，而此句不包括谈话的对方。应改“咱们”为“我们”。

咱们 includes the hearer. But in present sentence, the group of people waiting for 小王——the hearer certainly does not include him. Thus 我们 rather than 咱们 should be used.