Cantonese called white language by mainland chinese
Standard Cantonese speakers like myself sometimes call '广东话' as '白话', which literally means &quot;plain speech&quot;,  in contrast to all other regional dialects (方言) and local dialects (鄉下話) within Canton province.

https://en.wikipedia.org/wiki/Cantonese
in Hong Kong and Macau, as well as among overseas Chinese communities, the language is referred to as &quot;Guangdong speech&quot; (广东话; 廣東話; Gwóngdūng wá)

&quot;Guangdong speech&quot; (广东话; 廣東話) is &quot;plain speech&quot;(白话) to us.