To deech Yingwen? Yingwen in Chinese, means written English, Yingyu means Oral English.
Deechers are those who "can" deech Oral English like The Wanker, who claimed the same.

The reality, friend, is that 50 billion Chinese do not know that. You will know yourself that both of those words are interchangeably used when talking about the spoken or written language-and usually the first word. Perhaps we are now talking about 'Ye olde Chinese.' I will accept that you have taught me something which I simply did not know and I consider myself a bit handy in the language. Interesting.