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1.
the flaky skin on a gentleman's scrotal sack after he has scratched himself too hard.
I scratched myself so hard I developed balldruff
af drdruff 10. maj 2009
 
2.
The hardend leftover of male ejaculation, after a day or so, it becomes a flakey, dandruff like material.
dude, i think your friend had sex in here yesterday, look at the balldruff on the blanket, eww.
af Fish Snacker 16. marts 2007