out of mind

Related to out of mind: time out of mind

out of (one's) mind

slang Crazy. This phrase can be followed by "with" and the cause of the craziness. He's out of his mind 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 mind with exhaustion.
See also: mind, of, out
Farlex Dictionary of Idioms.

*out of one's mind

 and *out of one's head; *out of one's senses
Fig. to be silly and senseless; to be crazy and irrational. (*Typically: be ~; go ~.) Why did you do that? You must be out of your mind! Don't drive so fast, Tom! You have to be out of your head!
See also: mind, of, out
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • out of (one's) mind
  • out of your mind
  • great minds
  • great minds think alike
  • (as) sure as eggs (is eggs)
  • going, going, gone
  • going, going, gone!
  • a penny for them
  • be twiddling (one's) thumbs
  • be twiddling your thumbs