I am tickled the deepest shade of shrimp?

This is from the movie "Paddington 2." Phoenix Buchanan (Hugh Grant) is the host of the opening ceremony of Steam Fair and he says, " I am tickled the deepest shade of shrimp to have been asked here tonight to open this wonderful old steam fair." What does it mean, "to be tickled the... 顯示更多 This is from the movie "Paddington 2."

Phoenix Buchanan (Hugh Grant) is the host of the opening ceremony of Steam Fair and he says,
" I am tickled the deepest shade of shrimp to have been asked here tonight to open this wonderful old steam fair."

What does it mean, "to be tickled the deepest shade of shrimp" in the above quotation?

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