Top Definition
To have balls. To be brave.
what it means to have sac:

JFK himself. When he was in office, he stood before the world and promised everyone a man on the moon within 10 years. Thing is, nobody had started working on a space program at that point. JFK had no data to back up his claims, no insight into the practicality of space travel. But you know what he had?

The man had sac. The man had the sac to stand before the world and say “Yo yo, get this! We’re going to the moon.”
by Moggraider March 03, 2009

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