I have been recently seeing an expression under my profile picture which says:
flag weight 250
What does it mean? What is it for?
Simply: it is the way we order flagged posts. They still get looked at, but flags by known-good flaggers get seen first.
In this case you're considered a good flagger.
Everyone starts at 100. If you don't see a flag weight on your profile, you're still around the mid-section.
If you flag items and they're consistently deemed by moderators as good or valid, your flag weight increases. Maximum is 500.
The more you flag badly or frivolously, the more your flag weight will drop and the less importance future flags will hold.
You can move your flag weight in either direction by how well or poorly you flag items.