What does flat ball mean in Lanzhou dialect?

"Autumn" is a swear word in Central Plains Mandarin (including Shaanxi, Gansu, Henan, Hebei and other places), Jin dialect and Southwest Mandarin.

Pingliang is a prefecture-level city under the jurisdiction of Gansu Province, a sub-central city of Gansu Province approved by the People's Government of Gansu Province, an important node city of the Silk Road Economic Belt, and an ecologically livable city in the Shaanxi-Gansu-Ningxia Border Region with cultural tourism, industry, commerce and logistics as the mainstay. Pingliang is located in the northwest of China, in the east of Gansu Province, at the intersection of Shaanxi, Gansu and Ningxia provinces (regions), adjacent to Xianyang in Shaanxi in the east, Dingxi and Baiyin in Gansu in the west, Baoji and Tianshui in Shaanxi in the south, Guyuan in Ningxia and Qingyang in Gansu in the north. It is an important highway hub in the northwest of China, an important transit point of the second passage of Eurasia Continental Bridge, an important transportation hub, a major business town and a regional central city in Longdong, and is known as the "dry dock on Longshang".