I’m hard in the paint, like I fuck her on her period

from Childish Gambino – My Shine Lyrics on Rap Genius

“Hard in the paint” is a reference to the Waka Flocka Flame song of the same name. Generally, it means to be ready to bang (fight/scrap/shoot/kill/murder) like centers and power forwards do in basketball. However, in this instance, without being too graphic… The “paint” is menstrual blood, and he has a hard-on with which he is forcefully and passionately making love to a bloody vagina.

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