Definition
To behave in an extremely silly or foolish manner.
協傻，发傻
He must be off his chump to do something like that.
他一定是疯了才会做那样的事。
You must be off your chump, leaving your keys outside.
你一定是疯了，把钥匙留在外面。
She’s completely off her chump if she believes him.
如果她相信他，那她一定是疯了。