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1.
Giving a great deal of thought to something, whether it be something quite insignificant, or a life-altering choice that has to be made. Often accompanied by a vacant stare into the room.

Sitting on salt may have two fall-outs.
1) You may find a positive conclusion and end up "using the salt" for something useful,
2) You may come to a negative conclusion and end up throwing salt in your own wounds.

Sitting on salt about anything for a long period of time is disadvised.
Huh? Oh, sorry! I was just sitting on salt, I guess...
by Siabata April 07, 2011