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Definition 1: The stubble of hair on a man's testicals after he has finished manscaping.

Definition 2: When you shave your balls and your skin gets very rough and stinky.
Girl 1: Did you see that man's ball gruff?
Girl 2: Oh yeah, it was so rough and prickly

Man 1: Man, I have the worst case of ball gruff ever
Man 2: Yeah, my razor is very dull and causes me to get bad ball gruff as well.
by Jarl Balgruff December 29, 2011
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