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The slightly moist feeling between one's buttocks, specially around the anus generally felt on a hot day, after a day of heavy bum burping or after exercise. Bumsauce is not mearly sweat but actual secretion from the bum and is normally quite smelly. Also called sebum.
Note: this is NOT the same as the squits.
My goodness Mavis, you've got quite a beefy arse this evening. Best you wipe off the bumsauce with your knickers before I go down on you.
by Steven D November 19, 2006
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Major digestive issues also known as diarrhea.
Dude 1 – Man I got wicked Bum Sauce!

Dude 2 – Well fuck man that’s what you get for eating pizza out of the trash! God go buy a cookbook!
by Somecrazyfemmegirl September 06, 2006
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faecal matter in one of its more fluid states, such as diarrhoea
her sheets were covered in bumsauce
by Love February 09, 2005
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