A condition caused by excessive lint (commonly present in a new pair of underwear) clinging to the scrotum after the first use. The fuzz will fuse with ball sweat or Fermunda Cheese giving the appearance of an African-American's scrotum.
Trisha was disgusted at my Black Sack! She didn't believe that it was from my new pair of Fruit-of-the-Loom boxer briefs.
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a white girl who enjoys the black dick over the white
she truely was a Black Sack Maniac
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When something is extremely hard
This AP European Test is gunna suck big black sweaty ball sack
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A big boi slang fo Jack Black
This can also be used as an insult if you turn it around
YOU DAYM BLACK SACK or Man, Sack Black be all up in here, jump to de wheely and scram