gofer

The Pursuit of Happynessを読んでいます。
Between the ages of ten and fourteen, without asking for it. I received intensive on-the-job training for a career as a professional gofer.
"gofer" は "golfer" のスペルを間違えたわけではありません。どんな仕事でしょうか？
・Collins Dictionary: (slang, mainly US & Canadian) an employee or assistant whose duties include menial tasks such as running errands: But you don't tell the gofer anything, you just use him to keep all the nasty stuff away.
・Urban Dictionary: A term for an employee, servant, or slave whose primary responsibility is to fetch items and bring them back to his or her boss, master, or owner. Formed by contraction of the words "go for". As in: "Go for coffee, go for doughnuts, go for whatever we need you damn 'gofer'.": "I sent my gofer for coffee over twenty minutes ago. If he doesn't get back soon, I'm dropping his health care benefits!"