Thank God on Friday, then buy a ruby on Tuesday

from Lupe Fiasco – Peace of Paper/Cup of Jayzus Lyrics on Rap Genius

Meaning

Lu now references two restaurants, T.G.I. (Thank God It’s) Friday’s and Ruby Tuesdays. Friday is the holy day for Muslims, as opposed to Sundays for Christians.

This person prays on one day of the week then buys a ruby on another. Such a mix of religion and materialism is common in hip-hop — it’s practically Kanye’s stock in trade

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