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A difficult task or someone who is difficult to persuade.
He's still not convinced although I tried my best to persuade him. Such a numb bum!
numb bum by sinthya May 11, 2006
The numbness in your anus after having anal sex for the first time.
I woke up with numb bum after last night's party... guess that means I'm gay.
Numb Bum by DerpSirsAlot October 12, 2015

dirty herb numb bum 

When a chick refuses anal wet her asshole with your finger, take a bit of coke and blow it directly onto her anus. Wait a few seconds and proceed to fuck her ass she will never know you were there
Bitch wouldn't give up her ass the tease so I gave her the dirty herb numb bum and then gave her busfare and showed her the door

Rumb Numb Bumb 

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."
Rumb Numb Bumb by mark rodreegez December 27, 2010