airmail
n.— «Arriving officers were pelted with debris from the rooftops. The “airmail,” as the practice is known among police, stopped only after NYPD helicopters were called in and chased off the assailants with spotlights.» —“At least 10 people shot in lead-up to parade” by Sean Gardiner Newsday (Long Island, N.Y.) Sept. 5, 2005. (source: Double-Tongued Dictionary)
Further reading
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