I'm just an American expressing, give me some credit

from Ab-Soul (Ft. Ashtrobot & Punch) – Beautiful Death Lyrics on Rap Genius

Meaning

A nice triple entendre:
– He wants credit/props for expressing his emotions.
– He wants credit/money for the music he makes, in which he expresses his emotions.
– He wants credit/money on his credit card — American Express is a credit card company.

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