be out of (your) tree

informal

to be crazy or behaving in a strange way, sometimes because of drugs or alcohol.

Is he going to build the extension himself? He's out of his tree!

• get hold of someone
• get hold of something
• get hold of the wrong end of the stick
• get hooks into
• get hooks into someone
• get hooks into something
• get hopes up
• get in a lather
• get in a rut
• get in gear
• get in hair
• get in on the act
• get in on the ground floor
• get in someone's hair
• get in the way
• get in the way of
• get in the way of something
• get into a huddle
• get into a lather
• get into a rut
• get into bed
• get into bed with
• get into bed with someone
• get into deep water
• get into gear