She's responding, top is C. Ronson

from Jay Z – Jigga That Nigga Lyrics on Rap Genius

Meaning

She’s wearing a top that was designed by Charlotte Ronson for her clothing brand, C. Ronson. Jay actually signed Samantha Ronson — twin of Charlotte (as well as their perhaps more well known brother Mark) — to Rocafella at one point, and it’s a well-known fact that he is friends with the Ronson family.

Charlotte Ronson created her first clothing line, C. Ronson, in 2000, so it makes sense that Jay would be giving a friend’s fledgling fashion label a shout-out.

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