My Santa Claus was missing, catch you slippin' then it's Christmas
Motherfuck a wishlist, my ghetto was ambition

from A$AP Rocky – Long.Live.A$AP Lyrics on Rap Genius

Meaning

He didn’t have a good Christmas growing up so if you got a good gift and bragged about it, he would rob you for it, thus it would be Christmas for him.
You need ambition just to survive in his city, thus his city was ambition. He never needed to wish for anything.

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