Promise to never leave him even if his mama tweakin’
Cause my dad left me and I promise never repeat him

from Kanye West (Ft. Jay Z) – New Day Lyrics on Rap Genius

Meaning

It’s hard to imagine Beyonce as a drug addict (Jay may just use “tweakin' as a substitute for "trippin'”), but I guess the sentiment is there…

Again, Jay may be projecting his own childhood here — he has, after all, admitted to selling crack to his own mother. Perhaps his father, who Jay has in the past blamed for many of his troubles, wasn’t totally at fault in leaving. Maybe Jay has discovered that his mom had an influence on the situation herself. Either way, Jay has resolved not to leave his kid no matter what.

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