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*

-or-

"I think i better have a shower, my bum is currently covered in smelly wool."
de Chris Lawlor 21 juin 2004
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!!!
de Scottish Kaz 20 octobre 2003
A collection of grit and dust that take refuge in ones arse. It isn't actually fluff at all...more a build up of dirt and crust
"My bum fluff is itching"
de Squiffy 28 septembre 2003
when you wank so hard the fluff that has collected in your arse shoots out in a big ball of fluff
fluff
de damion 6 septembre 2003
fluff thats on ya bum...
*imaging man picking arse*

umm found piece of 'bum fluff'
de Ross 31 janvier 2003
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??''
de me jenny 8 octobre 2006
the fluff off a bum
a fluffy bottom
de laura simmons 4 octobre 2003

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