Can I say "out of one's mind" to my friend? and would it be rude to say it?
The expression "out of someone's mind" means that they are very crazy or being insane. If you are close with someone, you can say this expression as an exaggeration of "crazy" and it isn't rude. Usually, this expression is used to exaggerate so it isn't considered rude unless in a context where it is used more seriously, or if it is used to describe someone you aren't very close with. Ex: You're dropping out of Harvard? Are you out of your mind? Ex: He's going to jump off that cliff into the water. He's out of his mind!
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