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3.
An illness / infliction often found to affect 18 - 30 yr olds the morning after a big night out.

The bum wee is consistency of water, approximate density of 1001 kg/m3 and can be coloured various different shades of brown (linked to what alcohol has been consumed the night before - for example - Very Dark Brown = Guiness)

It can cause some "irritation" of the bottom, but this will subside once the bum wee ceases.
Very Dark Brown Bum Wee = Guiness
بواسطة Lord Bum Wee يونيو 7, 2009
 
1.
The liquid which appears during toilet backwash. Carries with it an awful and awesome smell that can eliminate a grown man. Can often be placed into normal conversation to add hilarity unknown to bystanders.
Tramp: "Can I have a wee bite o yer sandwich?"
Lewis: "Yeah, it's a bit bumwee though. Thats a nice bumwee you've got."
Tramp: "Is yer friend takin' the piss?"

Also

"My GOD! It smells like bumwee in here! The smell is like getting hit in the face. WITH A SHIT!"
بواسطة Farg_Meh اكتوبر 9, 2006
 
2.
Liquid Diarrhea that comes out with such force it feels like you are urinating.
Dont go in there Sarah has bum wees.

That curry gave me bum wees for a few days.
بواسطة iwikiwi فبراير 13, 2010
 
4.
An uncontrollable urge to shit in a flowing motion, Starting off as a stomach churning, gut renching feeling that is rapidly followed by a run to the nearest Restroom where severe sweating and panic ensues as the uncontrollable flow of BUMWEE pours out of your ass. After this painful experiance the Sting of the ring of fire is the reminder of what you have just experianced, other than the Pebble dashed pan you leave behind.
"Ah mate, I've just had the worst BUMWEE ever, proper pouring out!!"
بواسطة Expat Saudi Bumwees!! اكتوبر 1, 2009
 
5.
Poo so runny it is basically wee coming out of your bum
I had a bit of bumwee after that curry last night.
بواسطة julio! ابريل 27, 2008
 
6.
Diarreah.
Liquid shit or bum wee
بواسطة wurzel79 اغسطس 18, 2008
 
7.
Based on an anal explosion during the civil war in 1386, Capt. Donald Rumkinson of the 3rd dragoons lost ten of his best infantry men to bum wee when they were caught short and shot by the enemy whilst their rear ends were exposed. It is basically pissing from the arse and can strike at anytime, but is usual after a heavy night of booze, boot and greasy food.
He had bum wee and lost his lunch
بواسطة Chris and Stan سبتمبر 22, 2004