out of (one's) head(redirected from out of his head)
out of (one's) head
1. slang Crazy. He's out of his head if he thinks this plan is going to work! After yet another sleepless night, I'm starting to feel like I'm out of my head.
2. slang Very intoxicated from drugs or alcohol. You were really out of your head last night! How do you feel this morning? A: "Do you remember anything you said to me at the party?" "B: "Not at all—I was out of my head last night."
out of/off your ˈhead(British English, informal)
1 crazy: Are you off your head?
2 not knowing what you are saying or doing because of the effects of alcohol or drugs: Don’t even try to have a proper conversation with him — he’s off his head.