You're so unfair, sipping from your cup 'til it runneth over, Holy Grail

from Jay Z (Ft. Justin Timberlake) – Holy Grail Lyrics on Rap Genius

Meaning

A reference to the biblical phrase my cup runneth over from Psalm 23:5. Jay-Z has himself used this biblical line previously.

In terms of an idiom, Holy Grail refers to something as the absolute most sought after. In this case, the Grail is fame. In this interview Jay confirms the song’s themes and highlights where his verses come into the fold:

http://youtu.be/mo6GzsBi9wU?t=24m27s

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