"Bullshit" comes from "nonsense", which means to shoot the breeze and talk nonsense. As for how this "light" became an "egg", first of all, they are homophonic. In addition, different people have different views. Some people even added an associative word "XX" between "La" and "Egg". Adding the word "blind" before this "la" makes "la" an extreme situation-the language of the motherland is really rich. However, relatively speaking, "nonsense" is more elegant than "nonsense" The modern meaning of "nonsense" is not limited to saying meaningless words, but more refers to doing things, talking nonsense, failing to complete the task, causing or possibly causing bad results. Reference.