A run before night fall, usually done with nothing reflective and while wearing dark clothes. Generally done for motivation, usually in populated areas. If not back before nightfall, the runner will be hit by a car, thus the term suicide run.
A Suicide Run, if Night fall is at 7:00, start what would be a 45 minute run in the city at 6:30 and try to get back before sunset. What a rush.
Suicide machine:- A motocross bike of a 2-cycle engine. Named because of their high acceleration rates leading to people getting into trouble in tight areas in which they are unable to avoid obstacles.
Jonesy got wiped out by a tree on his YZ250! He booted it down the straight and couldn't pull it up in time!