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Sack refers to the male scrotum in this case. Synonym for "grow some balls" and other similar terms. Meaning: to accumulate or develop the courage or resolve to face a given situation.
"So you like her? Grow a sack and ask her out!"

"That's ALL you get paid!? Grow a sack and tell your boss you need a raise!!"
by Bleeorg December 22, 2003
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