Took two sips of the holy grail
Then I backed up and I turned around

from Lupe Fiasco – SLR 2 Lyrics on Rap Genius

Meaning

Lupe, among many other rappers, was not pleased with Jay-Z’s newest album. Despite being a large Jay-Z fan, Lupe doesn’t blindly label an album “classic” unless its quality attests to it.

Further expressed contempt with MCHG:

https://twitter.com/earlxsweat/statuses/355382673176399872

Don’t forget how he was just imitating the notoriously evil Adolf Hitler. Adolf Hitler was frustrated because he couldn’t get “as evil Lu get” — Lupe’s so evil, he took two sips of the “Holy Grail” (taking Holy Grail literally) and spat it out…

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