To be upset or angry, usually when one is put on the spot as talking out of their ass, or caught in a lie, a classic example would be someone who talked a lot of trash before a sports game and then gets beaten soundly and is pissed about it.
Brad bragged to Jim he could beat anyone in basketball, and talked trash for days. Jim challenged Brad and beat him 10-1, at which point Brad stormed off, salty.
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