An insult or description of someone who is so enraged about something they lose it and start acting like a insane person. Out of control. Similar to a rabid animal.
Addict 'Arold: Did you see that guy mixing ketamine and krokodil last night at the train tracks?
Regular Man Norm: Fuck no, what was he like?
Addict 'Arold: He was fucken frothing at the mouth!
