Being an absolute mad dog. Some may be referred to as a mad cunt or sick cunt.
Fuck! He's been struck by the mad dog disease, what a mad dog!
Sick cunt
Kills at everything in life
Total Dingo
That Mad Dog Killer’s a Total Dingo…
An extreme or overtly ridiculous show of mental decline such as screaming in public places or unironically enjoying political speeches.
Mainly used to refer to actions but can be used to describe a person.
“Did you see what Jessica did at the part last night?”
“Yeah dude that was mad dog crazy.”
The act of getting stalked by someone you don't want to talk to, but they are persistent to the point you can't go anywhere until you have talk to them.
I tried to come over to your pad, but my neighbor Mad Dogged me into hearing about her latest ailment.
Mad Dogging Face, or "MDF," is when a male constantly has a pissed off look or scorn expression on his face.
Male equivalent to the female version of Resting Bitch Face, or "RBF."
"That new dude, Sam, at the gym seems cool, but he has MDF. He needs to smile more to break that Mad Dogging Face."