n. expensive; [of a price] falsely bid up. : That price is a little salty. Is that the best you can do?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
salty
c.1440, "tasting of salt, impregnated with salt," from salt. Meaning "racy" is from 1866, from salt in the sense of "that which gives life or pungency" (1573, originally of words or wit). U.S. slang sense of "angry, irritated" is first attested 1938, especially in phrase jump salty "to unexpectedly become enraged."
[sawl-tee] 
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