Being salty is when you are upset over something little.

(noun) A successful type of theft which results in an acceptable, impressive and rewarding payday for the protagonist.

The act of being upset, angry, or bitter as result of being made fun of or embarassed. Also a characteristic of a person who feels out of place or is feeling attacked

A term originating from the United States Navy, used to describe disgruntled senior enlisted members. Also used to describe someone who has sea experience from a prior deployment, for whom the romanticized idea of ship life is gone, and replaced with sea salt.

Angry, agitated, annoyed, upset.

To be mad, angry, agitated, upset.

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.