You are salt when something unfortunate happens but you have to agree with it. Discontent, especially in an ironic sense.
"I'm so salt right now, my grandma just beat me at words with friends."
"Salt, there's only one left."
Can also be used as "Salty" or "SAN(salty ass nigga)"
"I bet he feeling salty!"
"Man I went to target and i couldn't get a refund!"
"She wouldn't go to prom with me.."
Jane: ohhh salt!
bob: shut up