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When your bum is irritated and uncomfortable and feels as if it is red. One may find they have a case of 'red bum' is the anus is irritated and almost inflamed.
"Well, darn Larry, last night I was eating burritos and drank about 30-something beers, had redbum all day."

Bum: I'm so sore and embarrassed *cheeks blush*
redbum by Red Bum Jihad August 10, 2013
Related Words

Redumbdant 

The act of using your turn signal to take an on/off ramp on the highway, and leaving it on for the duration of the entire circle.
Spoken in rage to the car in front of you: "I can see that your turning right, TURN OFF YOUR GOD DAMN SIGNAL YOU'RE BEING REDUMBDANT!"
Redumbdant by Crepuscular March 28, 2015
Rythm, as spoken in Georges St. Pierre's French Canadian accent. Refers to imposing his will on his opponents in the ring or octagon.
"No one can 'andle my riddum!" - Georges "Rush" St. Pierre, UFC Welterweight Champion
riddum by chaosomega December 4, 2006
A pace that nobody can handle. A person can use riddium in any type of sports or task. It's simply a matter of complete domination.
GSP (with the french canadian accent): "aye'm gonna poot so much pressure on diz guy dat 'iz gonna fall, u kno. 'Iz not gonna be abel too 'andle mye riddum".

The english translation would be:

"I'm gonna put so much pressure on this guy that he's gonna fall, you know. He's not gonna be able to handle my rhythm."

Evidently, it's much cooler with the Quebec accent.
Riddum by GreaseStPierre July 7, 2009

Redumblican 

The new nickname for the Republican party. Anyone who is for protecting the ultra rich and oil companies and Wall Street from being properly taxed
The current crop of Republican candidates for 2012 are Redumblicans
Redumblican by da_gawd_father August 17, 2011
The boy in the Shining keeps saying "Radrum" while walking through the empty hotel.
redrum by Anonymous August 17, 2003