Off one's head

prep_phrase, slang

Definitions

Prep_phrase
  1. 1
    Insane, crazy. Australia, British, colloquial
  2. 2
    Temporarily mentally unstable; very distressed. Australia, British, colloquial

    "The kettles they boiled with rage, 'tis said/While ev'ry nail went off its head[…]"

  3. 3
    Under the influence of drugs. Australia, British, colloquial

    "Occasionally they seem to go off their heads. Something like epilepsy, you know. It's called Robot's cramp. They'll suddenly sling down everything they're holding, stand still, gnash their teeth—and then they have to go into the stamping-mill. It's evidently some breakdown in the mechanism."

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