1
general::
Phrase(s): crazy about someone or something [and] mad about someone or something; nuts about someone or something; crazy for someone or something
Fig. very fond of someone or something. • Ann is crazy about John. • He’s crazy about her, too. • I’m mad about their new song.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Also, be mad about. Be immoderately fond of or infatuated with, as in I'm crazy about lobster, or George is mad about his new saxophone. The first expression dates from the early 1900s. The second, with mad, is much older; Shakespeare had it as mad for in All's Well That Ends Well (5:3): "madde for her"; and mad about was common by the mid-1700s.
American Heritage Idioms