Australian slang for a panel van, fitted out with the minimum of a mattress (but often quite elaborately decked out) and primarily used with the aim of using it to perform horizontal folk dancing in. "If it's rockin', don't bother knockin'" sums up the leitmotif of the sin bin owner very neatly.
An appropriate bumper sticker on a panno used a sin bin would be "if it's rockin', don't bother knockin'!"
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