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The brown dust that falls from the bottom of someone who doesn't wipe properly. It's the dust of dried-up feces.
Have you seen Lee's bumdust? It falls all over the place. They really need to learn to wipe properly.
bumdust by arthur the third December 12, 2023
Related Words
The brown fecal colour and flakes that appear around an anus.
When she bent over, Kyle could clearly see a ring of bumrust around her anus.
bumrust by jungletriad December 5, 2004

Bundustled 

Bundustled -noun.

When you show up for work and don't know what your hours are, and a fellow employee let's you believe you're a closer, even though you're scheduled off hours before.
Dude, you were off at 6, why are you still here?

Sara said I was a closer and I didn't check the schedule.

Bro... she bundustled you
Bundustled by B~ROB November 9, 2017

Bum Dust 

The little bits of weed left over at the bottom of the bag.
"Dude, all I got is like..a bowl's worth of bum dust.."
Bum Dust by B.Luv January 13, 2009
an anus that is riddled with fust,or a brown mossy type of fungus that is caused by lack of bum-hygene or clagnut infestations,mainly found surounding the clagnut riddled sphincters of fat girls,you can usually identify bumfust by the brown and black fluffy lumps of dryed shat and arse-hair,and also the ripe smell of arse vinegar and sour shit
i was just about to 69 the bitch when i got an eye full of bumfust!
her bumfust was of such a vast quantity that i puked on her beef curtains
bumfust by liam mccormack January 8, 2008

Bum dust 

Bum-dust: The bit of V shaped residue left on the back of a toilet seat after a poo.

Commonly containing a mixture of underwear fluff, skin and pubes.
Ffs Andy! You've left bum dust on the toilet again!
Bum dust by Sgt Poopybutthole June 10, 2022