Gump

[Dave Wilton]

While having lunch with business associates today, one referred to a mutual
acquaintance as "a gump." The person in question is a software executive of
low-to-mediocre skills and talents who has a history of being present when
others do great things and reaping the benefits, despite his having
contributed little or nothing--much like the fictional character Forrest
Gump is present for many great historical events.

I've never heard this used before.