out of your tree
INFORMAL1. If someone is out of their tree, they are crazy or behaving very strangely. `I'm going out of my tree with this.' — `Honey, don't let it get you down.'
2. If someone is out of their tree, they are unable to act normally because they have taken drugs or drunk a lot of alcohol. It was obvious they had taken something. They were both out of their tree.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012