It’s when you reshoot classifieds until you get a score for M Class....this can be spotted by the ammo truck you bring to a special classifier match.
This used to be a thing....until it got outlawed.
You can always spot the paper GMs and Ms when you look at the match results and they are constantly getting beating by run of the mill A class shooters....
Not all paper GM's have to grandbag. We used to have a local GM who was a holy terror on classifiers. He didn't have to reshoot them, but he didn't perform well at matches that required a lot of fast footwork and movement because of his age and injuries he just couldn't move well. He had to literally cut his shoes to pieces so his feet would fit. His email address was "TheLastGM" denoting his usual placement at major matches. Sadly, he is no longer with us and I miss his corny sense of humor.