Bum Sauce 

The liquid that is held between the cheeks of your ass that smells like a mixture of sweat and shit.

Person 1: Dude, I was sitting down all day, and I've accumulated some Bum Sauce
Person 2: EEEWW!! THAT'S GROSS! AIN'T NOBODY WANNA HEAR ABOUT YOUR BUM SAUCE!!

Bum Sauce by Jeffery Deadstein May 12, 2020

Bum Sauce 

A total bummer. Something super lame.

Oh damn little laxer hitting mad pipe. Total bum sauce man.

Bum Sauce by superkoolaid17 April 24, 2010

bum sauce 

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!

bum sauce by Somecrazyfemmegirl September 7, 2006

Bum sauce 

When you cum in the bum and some muddy bum sauce comes out

"Oh I gave you some major bum sauce didn't I Jordan"

Bum sauce by The King of Bum Sauce April 30, 2016

bumsauce 

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.

bumsauce by Steven D November 20, 2006

bumsauce major 

Means major bummer. Something you say when an unfortunate or untimely event occurs.

"Dude, I can't go to the bro sesh today."
"Oh, bumsauce major, man."

bumsauce major by ldawg2damax September 15, 2011

bumsauce 

faecal matter in one of its more fluid states, such as diarrhoea

her sheets were covered in bumsauce

bumsauce by Love February 9, 2005