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1.
Facial hair that is so sparse it can be considered as good as the fluff on one's bottom
That's not a moustache - that's bum fluff
by Gordon April 02, 2003
 
2.
feeble facial hair
That ain't a beard, it's just bumbluff
by Tony50 May 08, 2003
 
3.
Any random bits of hair that look like they shouldn't be there or just fluff.
"Look at that mostache its jus bumfluff!"
"You got bumfluff on ya jumpa."
by Emmax x x May 21, 2005
 
4.
light downy growth of adolescent facial hair; also written bum-fluff or bum fluff

used as an insult, mainly in britain
"Oh listen to me, you antipodean fleck of bumfluff!"

-- House talking with Chase in the Season 2 bloopers of "House M.D."
by House's 2nd Best Friend October 10, 2008
 
5.
Bum fluff is literally sparse and whispy facial hairs on an adolescent boy, (Or Asian girl)... Tee hee! Which resemble peach fuzz, under-bed lint, gossimar threads... or any fine downy substance.
"You look a right cunt with that bum fluff on thy face mate! Grow up and stop trying to look like a blonde girl's arse!!!!" * Mr Kipling's Diaries.*
by Spillage66 August 05, 2007
 
6.
It is someone so cute that they appear fluffy like a cute baby kitten.
You are my bumfluff. I want to take you home.
"Mommy, can I keep him/her?"
by BIGGEST BUMFLUFF July 04, 2012
 
7.
Hair on the chin that nobody likes!
Chips has alot of bum fluff!
by Adam Stevens March 31, 2005