When 'scud running'; does a heli pilot deliberately fly below the MSA and hope they can see and stay above the terrain ?
It's when the weather is close to limits for VFR flight and often in variable terrain - people often take a punt on the weather being better just up the road and, when it's not, often push on anyway.
The end result is getting lower and slower (usually) before either turning back or landing.
If you do neither and push on into it, chances are you will end up IIMC with no plan, usually in a VFR only helicopter and with a pilot with no IR or even basic instrument training in cloud.
Most won't have a clue what the MSA is, let alone have the skills to get them there and back down again.
The end result is very often fatal - witness the number of discussions on these pages.
Apparently, doing this makes you a good pilot who sometimes **** happens to.