When a hurt, spiteful person posts something personal, private and intimate about another person where that person will in turn feel betrayed, embarrassed, hurt, or even criminally prosecuted.
She told John she wanted to be with him for the rest of her life, then she changed her mind. John didn't take too kindly with her decision. He told her, "Bitch, I'll Facebook your ass, so he Facebooked her ass and posted her brazenly bragging about all of her recent misdeeds
The sentence I dump your ass comes from Netflix’s original series « stranger things ». When someone says I dump your ass, they’re mad or post off because you did something bad or your just annoying. Most people now use the sentence to say to a guy or gal for attention or go making them feel bad and win them back yet for again, winning them back.