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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.*
bum fluff by Spillage66 August 6, 2007
Ah you're all wrong it aint on your arse it's on your face....god
hey you might wanna shave that bum fluff
Bum fluff by MaHe November 27, 2003
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"
Bum fluff by alkies December 4, 2015
When an adolescent boy first grows facial hair it looks all wispy and yucky. This hair resembles the fluffy hair on some people's bums. So shave it off or you can look ridiculous. Girls really hate it. I'm a girl!

So shave it off and get a REAL beard started!
Once I was up close to my big brother's friend. He had heaps of Bum Fluff on his face which made me want to PUKE!
bum fluff by fclb July 25, 2008
Chips has alot of bum fluff!
bum fluff by Adam Stevens March 31, 2005
"bum fluff is not real facial hair.
do not try and grow a beard of bum fluff"
bum fluff by ben dover March 24, 2003