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A 'rumb numb bumb' is generally defined as the act of; firstly, having anal sex with a black woman for a long enough period of time as to greatly open up her anus, secondly, using a funnel (or a similar funnel-like device), one must pour alcohol (specifically rum) into the opening and thirdly, one must then drink the rum out until one's mouth is rendered numb from the alcohol.
Tim: "So, Bill, how'd your date with Sha'quesh'qua the other night go?"

Bill: "Dude, you wouldn't believe if I told you; I totally got a rumb numb bumb!"

Tim: "Raunchy, bro!"

Bill: "It was chill."
by mark rodreegez December 27, 2010
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