I just heard a joke in Northeast dialect, saying that Ula and Leng are flying in the sky. What do they mean?

That's an old joke in the northeast, making fun of people with big tongues and inaccurate pronunciation. ? Medically, it is called slurred speech, also called slurred speech, commonly known as "Lickitung".

Lickitung is caused by abnormal physiology of pronunciation organs or abnormal discharge of pronunciation airflow direction, which will lead to various forms of inaccurate pronunciation. Some people are also called "Lickitung" because of the inaccurate pronunciation of dialects.

Extended data:

Lickitung's judgment method:

(1) At the age of two, most children can't pronounce short sounds accurately.

(2) With the passage of time, this situation will disappear automatically (most children).

(3) Only 1% of the children failed to achieve correct pronunciation, which led to some initial consonants being inaccurate, thus forming dysarthria. They still continue the pronunciation habit of 2-3 years old, and over time they form a conditioned reflex of the wrong pronunciation method.