the fluff that gathers in your anus after a long day of sweating
dude you got bumfluff on your face
by yar mudder June 11, 2006
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Originating from leprechaun rectums in south ireland, bum fluff is the fibres of sweaty underwear that sticks to the scrotum and "Batty criece" when a respectable amount of sweat has been produced that day. On a hot day, people may be seen pulling their underwear out of the arse with their hands, this usually occurs when bum fluff is present.
"Ooh it's hot today isn't it?" *pulls underwear from bum crack*


"I think i better have a shower, my bum is currently covered in smelly wool."
by Chris Lawlor June 21, 2004
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The growth of hair aroung the arse area which causes such an itchyness that you end up walking like you've shit youself!
If you had to be any fluff in the world bumfluff would be the shitiest!!!
by Scottish Kaz October 20, 2003
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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
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The fluff or dust in which over weight men have forming in their umbilîcus.
''oh my marcus, is that bum fluff that i see in your umbilicus??''
by me jenny October 08, 2006
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