mad about (someone or something)
1. Very enthusiastically fond of someone or something. Teri is just mad about her new boyfriend and won't stop talking about him. Ever since she started taking lessons as a kid, Amy has been mad about tennis.
2. Upset or angry about something. I can tell Perry is mad about something, but he won't tell me what it is. Is Luanne still mad about me missing her recital?
mad about
Also, mad for. See crazy about.