pass-by meeting
n.— «“The exchange, such as it was, was limited and was on Iraq…. It was a pass-by meeting,” he told Reuters, using the term for a brief informal encounter.» —“Senior U.S., Iranian officials meet at Iraq talks” by Mariam Karouny, Sue Pleming in Sharm El-Sheikh, Egypt Reuters May 4, 2007. (source: Double-Tongued Dictionary)