Niggas wanna try to hem my long jeans

from Jay Z (Ft. Jaz-O & Sauce Money) – Bring It On Lyrics on Rap Genius

Meaning

This is Jay playing off the previous line. Its an extended metaphor. To get the wrinkles out of Jeans people usually steam them. Additionally, white establishment generally condemns baggy jeans which gangster style at the time espoused.

Hem could also mean that they’re trying to take his money by shortening his pockets

Or rob him off his Longines watch

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