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1. fat sac
a large sac of marijuana.
"Let me buy that fat sac off you."
2. Fat Sac
A water filled bag used to add ballast to boats in order to produce a larger wake. This enables wakeboarders to get more air.
The Fat Sac ads up to 600 pounds of weight to your boat.
by TT Sep 12, 2003 add a video
3. Fat Sac
An exceptionally large scrotum.
DAMN!!!!! DAT fool's got a FAT SAC!!!!
by fun-o-bunz Aug 13, 2003 add a video
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