Bombogenesis is a storm to the extreme. We usually see it when a storm forms over the Atlantic ocean and literally explodes. Going from a minor storm to a major one in less than 24-hours. Many of the major nor'easters that have impacted New England are the result of bombogenesis. You'll often hear a forecaster say the storm is, "bombing out". It means that the system is developing so fast, it's more like an explosion in the atmosphere.
These "bombs" often develop as low pressure moves off the East Coast in the cooler months. With relatively warmer water to feed the storm they intensify rapidly. These storms can produce hurricane strength winds and cover a large area. The Blizzard of 78 was the result of bombogenesis.

Mike Wankum
Meteorologist
WCVB