Young Hov' in the house is so necessary
No bra with that blouse, that's so necessary
No panties and jeans, that's so necessary
Now why you fronting on me, is that necessary?

from Jay Z – Change Clothes Lyrics on Rap Genius

Meaning

Hova lists some necessary things that girl should do when they go out to make his life easier: don’t wear a bra under a blouse, nor panties under jeans!

The girls (or their boyfriends!) might come at him after these lines since they might feel offended, but Jay doesn’t feel like it should be that way!

The phrase why you frontin' on me?“ may also be a reference to Pharrell & Jay-Z’s previous song together “Frontin'”

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