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

False:

    他们俩个今天晚上也动身。

    Tāmen liǎnɡɡè jīntiān wǎnshɑnɡ yě dònɡshēn

True:

    他们俩今天晚上也动身。

    Tāmen liǎnɡ jīntiān wǎnshɑnɡ yě dònɡshēn.

 

俩的意思是两个。既包含数词“两”，又包含量词“个”。俩的后面不能再接个或者其他量词。

俩refers to 两个. As the combination of the numeral 两 and the measure word 个, it can not be followed by any measure word including 个.