I believe it's actually a rugby term, and the idea is to wrestle things across the line at a regular cadence as a team.

The unit of work is even called a sprint because the idea is specifically to commit to very intense units of work.

Some managers tell their teams that they need to be more agile, I guess when referee yells "scrumble!" everyone sprints with a lot of agility.

I'm an engineer type, most of this makes very little sense to me.