And I'd just be coming off the top, asbestos

from Young Money (Ft. Lloyd) – BedRock Lyrics on Rap Genius

Meaning

Asbestos is a building material that was commonly used in roofs constructed before 1980 as a fire retardant and insulator. It’s now removed, when possible, because it’s a dangerous carcinogen

Just as asbestos comes off the top of ceilings for safety reasons, Nicki “comes off the top” (freestyle/improvises her raps)

This is a double entendre. She’s “coming off the top” of her head as in freestyling, but she’s also “cumming (orgasming) off the top (oral sex)”. Or maybe she likes to ride and be on top and she’s cumming from that.

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