From where they rock ski-masks and don't nobody ski
Every time I spit a verse, my city like "Preach!"

from Big Sean (Ft. James Fauntleroy & Nicole Lequerica) – Fire Lyrics on Rap Genius

Meaning

Every time Detroit hears rhymes from Sean, they praise him because of how far he as made it out of the oh so cold D
http://www.youtube.com/watch?v=aktLRiWXfqg

“Rock ski-masks and don’t nobody ski” is talking about robberies and crime in Detroit.

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