A synonym for something being 'cool' or 'alright'. It is frequently used in southern England to show other people that you are calm and that you have understood what they said. Most commonly used in practice with the word 'okay' or 'alright' in front of it.
1: Hey man, I'm off to Chicago
2: Okay, polio, take care
1: Drop the gun!
2: Alright, polio, relax!
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