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Comes from the old saying "just a silent par" where the accused doesn't know what the par is.

Shaun Parr (lad) has been used to create an easier saying than "just a silent par"

By using "just a shaun" it has been shortened down and also has the meaning of a silent par. Making it easier all round
Just a shaun there ollie
by Tarquinos July 15, 2014
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