Australian speak for 'see you soon', or 'see you later'. It is considered much more polite than traditional 'goodbye' or 'cya' and is used by many South Australians, specifically those in the Northern area. The standard reply to this is 'Onya, sonya; also'.
"I'm going now. Onya, sonya."

"Onya, sonya; also."
by xopotato March 28, 2016
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