A rush of low health, fast moving characters with short/melee ranged weapons. Derived from the first class in Team Fortress 2 which had the potential to sprint pass enemy defenses and take control of a key node, due to their increased capture rate.
Modern Warfare 2 player #1: Dude, why did no one diffuse the bomb in that last Sabotage map?
Modern Warfare 2 player #2: We all tried, man, but they scout rushed us; no one could live long enough to do it.