...someone commits illegal, Immoral or unethical act(s) and has not 'fessed up even though everybody may know about it but so far the perpetrator hasn't been busted. The implication is that he/she will eventually get caught.
"I see they finally indicted Representative Anderson for bribery and money laundering--he's been riding dirty in the legislature for years..."
"Jack's girlfriend and his wife joined the same Oprah book group and found out that he's been riding dirty both ways...he's sleeping in the office now."
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