student asking question

What does "mental that one" mean? What kind of expression is it?

teacher

Native speaker’s answer

Rebecca

This is a British expression that means "crazy" or "out of their mind." I am not British, but I believe this expression is slang. When Ron says, "Mental that one," he tells Harry that he thinks Hermione is crazy. Ex: She's completely mental. Ex: Going shopping before a holiday is mental.

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