An action named after English footballer Wayne Rooney, who is a stereotypical English chav. The action refers to anti-social behaviour where the person or persons 'roonays' or breaks something, generally whilst in an intoxicated state. Ususally, after the incident has occured the persons friends will mimic Manchester United supporters by chanting "Roonay, Roonay Roonay!" and pointing their fingers.
"Lorcan, that was a pretty Roonay thing to do."
"Joe, that was such a Roonay comment"