Top Definition
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

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feeble facial hair
That ain't a beard, it's just bumbluff
by Tony50 May 08, 2003

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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

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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

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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

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The weird hair that teenage boys have above their top lip around the time of puberty. Like a first moustache
"Ew, he's gross, he has bum fluff on his lips"
by alkies December 04, 2015

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Hair on the chin that nobody likes!
Chips has alot of bum fluff!
by Adam Stevens March 31, 2005

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