what the Devil

Interjection

Meaning

what the Devil?

(idiomatic) Used to add emphasis to “what” when beginning a question.
What the Devil have you done to the horse?

Source: en.wiktionary.org

Synonyms

what the dickens what in god's name

Close letter words and terms

what the baptist what the cuss what the deuce what the dickens what the doctor ordered what the ef