I had no idea. Even as an ABC who still speaks semi-competently, I'm having trouble figuring out Niūniū, niù, and, níng. What are the characters? Isn't pinch 捏?
妞妞牵牛,牛拗,妞妞拧牛。妞 means girl, 妞妞 is a common name for little girls; 拗 has two different pronunciations, ao and niu; the ao pronunciation is usually used as a verb for bending something, while the niu pronunciation is usually an adjective for stubbornness. I guess 拧 is better translated as to wring or to squeeze and twist, but you get the idea.