At 05: 23 on May 20th, 2008, a Baidu bar friend named "Poison Bear" posted a post in the World of Warcraft Post Bar asking what "LZSB" meant, and another Baidu bar friend "shenqi4 127" replied the words "Lanzhou baked wheat cake" because it would be difficult to press "LZSB" in the input method. There is also a saying that in 2008, Sogou pinyin input method entered the world of netizens. Due to the modularity of sogou Pinyin, many people typed the English letter "lzsb" without reading it carefully, resulting in the phenomenon of "Lanzhou sesame seed cake". Later, when more people were wrong, they naturally understood and became a euphemism in disguise.