British slang, it means something thats very offensive or extremely unfair.
Kid: You're a liar, Harry!
Harry: *Stomps upstairs and Ron follows him.*
Ron: That's bang out of order!
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When someone fails to carry out the operations in a math problem correctly, often because they couldn’t remember the rule, or they use their own oft-flawed logic to do so.
John flunked his recent class test, because he’s a victim of out-of-order math—he repeatedly misused the BODMAS rule to simplify arithmetic expressions, and misapplied the procedure to find the inverse of a matrix.
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verb; to be dining out and feel shame as fellow diners at one's table order and receive a better dish
Even though Ron only got the macaroni and cheese and I ordered the curry risotto, he totally out ordered me.