A frantic dash, usually from one side of a city to another. Also emergency travel between two countries organised at the last minute to try to prevent something terrible from happening.
Reminiscent of a monkey running on the ground from a predator looking for a safe tree to climb. Arms and legs are usually swinging from side to side and the monkey has a grin of terror on its face.
Monkey runs typically have a success rate of between 30% and 50%.
Sandra suddenly realised that she left the CD-Rom with all the photos in her husbands lap top. If he turned it on the game was up. She decided she would have to do a monkey run to London that night.