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1.
Lint that collects in your ass hair, especially during night time.
During my morning shit, I wiped away all the assfluff that accumulated during the night.
by Cyberwolf December 12, 2006
 
2.
When a male or female has pubic hair growing around their ass hole.

Usually in males flakes of shit can be found hanging from the hairs.

Can be spikey on the cheeks when shaved.
'Dude the chick i fucked last night had shit loadsa ass fluff!. I didnt know whether to fuck it or brush it!'
by AliceW January 04, 2009