Possible Clues:

• Dull, low-paying work, in slang
• Minimum wage provider, facetiously
• Flipping burgers, e.g.
• Position that probably won't get you invited to a work holiday party
• Position with no prospects
• Starts off mare's colt, jumping over big rotten post
• Low-status employment
• After-school position for many, in slang
• After-school position for many
• Low-paying position, slangily