The stomach, most natably named because it is literally a sac shaped like the letter J.
dude1: "dude, you look tired."
dude2: "ye, i haven't filled my j sac in hours."
by ego-tripper August 1, 2009
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slang term for sacajawea coins. They are gold and equal to one U.S. Dollar. They give a nice jingle inside of a bag. You can ask for them at your bank and they will give you them.
Alright leave a couple Sac-Js on the table for the tip.

When trying to find out what U.S. Currency best fit the circumference of his nipples, Carl concluded the Sac-J was the best choice.

Into his pants
He searched for some change
pulled out his hand
and found a Sac-J
"Hooray" he exclaimed.
A dollar in change!
How strange.
Golly, How strange.
by Sean Manning December 1, 2005
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