Definitions of devil:

• noun:   a word used in exclamations of confusion

  Example: "What the devil"

• noun:   one of the evil spirits of traditional Jewish and Christian belief
• noun:   (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell
• noun:   a rowdy or mischievous person (usually a young man)
• noun:   a cruel wicked and inhuman person
• verb:   coat or stuff with a spicy paste

  Example: "Devilled eggs"

• verb:   cause annoyance in; disturb, especially by minor irritations