Implies the person is not highly respected and does minor tasks others don't want. The new intern became the team's stooge, making copies and coffee runs.
Pro Tip 2/3
Negative Connotation
Often used negatively to suggest someone is easily controlled or used. Don't be their stooge and stand up for your own ideas.
Pro Tip 3/3
Subservient Role
Highlights a power imbalance between the 'stooge' and those they assist. She felt like a stooge, always doing her boss's personal errands.