the combination of being both sour and bitter
In chemistry, acids are usually described as being sour, whereas bases are described as being bitter; the neutralization of an acid and a base produces a salt, and thus, salty.
The folks: That old man Jenkins was so bitter about our parking in front of his mail box. I've never seen a more sour expression...
You: Oh wait, so he was like salty?
The folks: ohhh...hon, is that how you talk during job interviews?
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