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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*
by Red Bum Jihad July 07, 2013
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When you are having sex and you keep smacking your partners ass so that it turns red like a baboons.
I was having sex with Taylor and she kept telling me to smack her ass, she went to pee when we finished and she had massive case of red bum!
by Kingkoopa172 December 08, 2007
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