In reply to:

My teenage kids in bi-lingual Anglo-Welsh schooling have recently brought home the expression <kifted>, which seems to be used in analagous ways to "out of kilter". A typical sentence might be "The post on the machine's all kifted", meaning something like bent, deformed...

Anyone come across this or anything like it?

Yeah, a friend's son came home from school with the announcement: "My teacher says I'm a gifted kid."

His dad replied: "Are you sure he didn't say 'kifted git'?"