呼叫凹凹凹凸曼叔叔
[hū jiào āo āo āo tū màn shū shū]
A playful and nostalgic nod towards an old-fashioned TV character. In simplified characters used by mainland Chinese, 叔叔 generally shows politeness when addressing elders or respected figures, especially males. 凹凸曼 refers to Mr.Aoto - A Japanese anime/cartoon popular in 80s China, signifying fond recollections of childhood entertainments and cultural exchanges between nations.