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.