And he wasn't the first to successfully try but he did
He took me to the basement and after the lights had been cut
He whipped it out and sodomized and forced his cock through my gut

from Angel Haze – Cleaning Out My Closet Lyrics on Rap Genius

Meaning

“He” could be referring to many people, I think it’s safe to say that this might of been a family member (possibly the father or uncle) that performed these acts of molestation and sodomy to Haze when she was just a child.

In “Castle on a Cloud” Haze also talks about molestation, abuse, and rape, all of which are talked about in this song as well. However in that song she refers to other characters that are not clearly targeted as being herself while in this song it seems like she is indefinitely talking about her own past.

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