Now you're gettin done without Vaseline
Vaseline is a petroleum jelly brand that is commonly used as lubricant for anal sex (in this case) and masturbation.
So LL is saying that he’s dissing you harder than getting fucked in the ass with no lube — which would be pretty rough. This line was most famously used as a sample in Ice Cube’s diss to his former N.W.A. members “No Vaseline” as the hook.
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