We didn't use a rubber, but I came on her body

from Nicki Minaj (Ft. Bobby V & Lil Wayne) – Sex in the Lounge Lyrics on Rap Genius

Meaning

They had unprotected sex, not using a condom (“rubber). It implies that he doesn’t care about the consequences of unprotected sex. He pulls out and ejaculates (cums/"I came”) on her body as a method of contraception.

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