It means spare tire, and its extended meaning is often used; For example, "In order to perform for Qingtai, many Hua Dan have devoted their efforts. Chen Fala, Liao Bier, Hu Dingxin and Chen Ziyao all wore sexy dance clothes when they performed "Shining Dance Floor", revealing sexy waist and exposing long legs. " Although Yang Xiuhui's long legs also have heads, when he twisted his waist, a few inches of "beer beer" was ugly. "