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1.
Australian slang for the question "Care to join?"

Case to John originated through the use of sending sms text messages without editing words on dictionary, which assumes that we have intended to ask a friend "case to John" instead of care to join. It has become a colloquial term in small groups of people since.
"Hey, we are going down to the pub, case to John?"
av Captain Banana Joe 14. februar 2010