What do you mean by "big foreign girl" in Northeast dialect?

Big foreign daughter: niece.

Northeasters like children, and they often don't like to be crowned with small words, but with big words. Girls from Dalian Foreign Studies University have always been famous for their beauty, and there is a saying that "learning from Beijing Foreign Studies University is beautiful in Dalian Foreign Studies University".

Northeastern dialect source:

northeastern mandarin, a branch of the official dialect of the Sino-Tibetan language family, is the main dialect in most parts of Heilongjiang Province, Jilin Province, north-central Liaoning Province, eastern Inner Mongolia Autonomous Region and northeastern Hebei Province, with more than 17 city and county flags and a population of about 12 million.

northeastern mandarin can be divided into Jishen tablets, Hafu tablets and Pinus thunbergii tablets, and each tablet can be divided into several small pieces.

northeastern mandarin is close to Putonghua as a whole, and the Northeast dialect that outsiders think is actually northeastern mandarin in some areas of northeastern mandarin. Although the accents in Northeast China (except Liaodong) are slightly different, this difference is only the depth of "Northeast Flavor", and there is no difference in vocabulary and language, and there is no big change in sound.

above content reference: Baidu Encyclopedia-northeastern mandarin