He a child, but they treat him like a bigger man
Cause when the pen in his hand, they big 'em up like he Jigga man

from Joey BADA$$ – Summer Knights Lyrics on Rap Genius

Meaning

Despite his young age, people treat him like he’s grown because he gets compliments like he’s Jay-Z (aka Jigga Man) every time he pens a rap. Also, after the death if Notorious BIG, people started BIGging up jay as the best rapper alive.

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