Ou ain’t never seen a long dick
I said a long dick
I said a long dick, bitch
You gone learn today, you gone learn today

from Danny Brown – Shouldn't Of Lyrics on Rap Genius

Danny is asking the girl he asked to suck his dick in the line before if she has ever seen a long dick like his before. He then repeats himself, presumably because she is still stunned at the sight of his long dick. He then tells her she’s going to learn today, meaning she’s going to get that long dick of his. Danny is also referencing a bit from comedian Kevin Hart who tlaks about his dad coming to his school and a girl asking what’s that in his pants and he responds by saying, “You ain’t never seen a long dick before? Well you gon' learn today.”

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