Bat

Bat is slang for crazy or insane. It is often used to describe someone who is behaving in an unpredictable or irrational manner.

Bat can be used to describe someone who is acting in a wild or chaotic way, often without any regard for logic or reason. It can be used both affectionately or negatively, depending on the context and tone of the conversation.

Examples:
1) “Did you see John at the party last night? He was going bat, dancing on the tables and singing at the top of his lungs!”
2) “My boss is driving me bat with all these last-minute requests. I can’t keep up with his constantly changing demands.”