When someone has really embarassed you in public, preferably in school or at work. After insulting you (preferably by physical means), they stand over top of you or climb to a higher point than you and shout down at you, "you just got mad dogged!"
I ran over to Tom, tackled him from behind, and stood over him in front of all the Senior girls shouting, "YOU JUST GOT MAD DOGGED!" to which I promptly added.... "Bitch!"