I know she bout to ask me how she look
I tell her beautiful, and how long it took
For you to put it on
She looks great, but he knows that’s not really her. He wants to know how long it took because it doesn’t look like her anymore.
He says “I know she bout to ask me how she look” to show that this is common for her to ask because she wants confirmation from him. This is why it’s future tense. Same thing with the next verse “I tell her beautiful and how long it took”. He always tell her that she is beautiful when she puts on her make-up because it something she wants to hear. It is not necessarily something he wants to say. So he follows up with “how long it took” to express his uncertainty. “For you to put it on” could be taken literally but it could also mean that she’s putting on; it is not a reflection of who she really is but rather it is a mask to hide her true self.
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