For general craziness:
* Bonkers: This is a very common and versatile term, meaning completely mad or silly.
* Barmy: Similar to bonkers, but with a slightly more old-fashioned feel.
* Dotty: Used to describe someone who is slightly eccentric or not quite right in the head.
* Loopy: Implies someone is slightly off-kilter or behaving strangely.
* Mental: This term is quite strong and can be used to describe someone who is completely out of their mind.
For being enthusiastic or excited:
* Off your head: Used to describe someone who is very excited or enthusiastic, often to the point of being silly.
* Baffled: Can be used to describe someone who is confused or bewildered.
For being drunk or high:
* Pissed: This means drunk.
* Off your trolley: Implies someone is intoxicated or under the influence of drugs.
For being angry or upset:
* Round the bend: Used to describe someone who is losing their temper or becoming very frustrated.
* Off your nut: Similar to "mental" and often used to describe someone who is very angry.
It's important to note that the specific meaning of these terms can vary depending on context and region.