deicing the cake

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. What does she mean by the next sentence?
    Joe’s deicing the cake!
  2. I wonder why Joe has a funny look.

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2

She is using it to mean “removing the icing from” (“icing” in this case is a kind of sugary decoration).

The “joke” is that “de-icing” normally means removing the ice from (e.g. from a car windscreen, runway, etc.).