It means to publically insult or demean someone even if it's unintentional, especially when they're around someone they're trying to impress.
similar to cramp your style
perhaps derived from "sult," as in "insult my game."
Tryin to front like he rich
Done shot your credit, cause you bought you a new E
320, and you wanna be a hoe like me
Now you done salted my game
Told my girl I'm a player, and you bought her a ring
You paid a lotta money just to grab her
I'ma tell you like this, trick: you can have her