Qingdao dialect is the local dialect of the city of Qingdao, in China's Shandong Province.
Often characterized as requiring a "fat tongue", the Qingdao dialect often adds a θ ("th") sound to Mandarin's ʂ ("sh"), ɕ ("x"), and s ("s"). It also obliterates many Mandarin tones.
The basic, though not at all universal rule for converting Putonghua to the Qingdao dialect in the pinyin system is that a Mandarin 1 tone will become a Qingdao 3, 2 becomes a 4, 3 becomes 1 and 4 remains four. Qingdao dialect's 1 tone (Mandarin's 3) also has a drawl to it. (the pinyin tones are: 1ˉ 2ˊ 3ˇ 4ˋ)
Nearly all Qingdao natives can understand Mandarin, but they will often respond in the Qingdao dialect without realizing they are doing so. The Qingdao dialect is not necessarily standardized throughout Qingdao. Different neighbourhoods, from Zhanshan to Xinjiazhuang to Maidao, will have their own variations.