have (someone or something) for breakfast
To defeat, complete, or handle someone or something easily. Often used as part of a boast. He can challenge me all he wants—I'm not worried! I have chumps like him for breakfast! If anyone can write a term paper in one night, it's Rich—he has assignments like that for breakfast!
have someone for breakfast
Fig. to defeat someone with ease. Careful, she'll have you for breakfast if you're not prepared to debate her. I'm afraid they had our team for breakfast again.