be out of (your) head

British, American & Australian, informal, British & Australian, informal

1. to be crazy.

He took the car out in this weather - He must be off his head! (informal, British & Australian, informal)

2. to not be in control of your behaviour because of the effects of alcohol or drugs.

She's completely off her head, she is - what's she been drinking?

• the road to hell is paved with good intentions.
• the roof caves in
• the roof falls in
• the rot sets in
• the rough and tumble of
• the rough and tumble of something
• the rub of the green
• the ... rung on the ladder
• the salt of the earth
• the same old same old
• the same old thing
• the same to you
• the scales fall from eyes.
• the scales fall from someone's eyes.
• the scene is set for
• the scene is set for something
• the school of hard knocks
• the scum of the earth
• the seven year itch
• the shape of things to come
• the sharp end
• the shit hits the fan
• the shit out of
• the shit out of you
• the shoe is on the other foot