Look at the meaning of blue and purple in northeast dialect.

Teasing people. Northeast dialect refers to northeastern mandarin, which is distributed in the northeast of China and the northeast of Hebei Province except Liaodong Peninsula. As a northeast dialect, "Blue Purple" means to tease people, which is what we call joking. Dialect is a local dialect that is different from the standard language in a language, such as Cantonese and Wu dialect in Chinese.