"Put some salt in it"

Recently I heard someone use the phrase "put some salt in it". The use was obviously figurative, but I really did not know quite what was meant. Is this a common phrase? Does it have a general meaning as a metaphor?
Thanks. - Patty

Not a common phrase to my knowledge. What was the context--put some salt in what? May be equivalent to "spice it up"--would that fit?

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