Top Definition
When you eat something so rotten that your body wants to get rid of what you consumed so fast that it bypasses every part of the digestive system and heads straight for the exit.
friend:Oh god what is that stench?
me:Sorry mate, at a late night California Burrito @ Filiberto's (aka Fili-squirt-o's) and gave me a bad case of wee bum.
by LtDan September 07, 2012

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Slang term for the virus enduced gastroenteritis which causes the suffer to endure vomiting and diarrhea simultaneously if not sequentially. Commonly known as weebum to those borders of Riverview who endured its wrath in the summer of 2004.
Damn those borders have weebum, watch out!
by Adamus Tribunus March 02, 2007

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diarrhea
Quite simple really, when you go for a poo and it comes out liquid
Mate i was on the premix bourbon and cola last night bloody had weebums all over the place this mroing
by seaper December 30, 2011

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explosive diarrhea, when high speed fluid erupts from the anus when either ill or from food poisoning. can result in splarting when solids can teporarily block the stream forming blast a radius.
"I couldn't make it to work because I had wee bum"
by wordology April 30, 2010

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The Urban Dictionary T-Shirt

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