carhop
Carhops are waitstaff who deliver fast food to customers' cars at drive-in restaurants. Historically, they usually worked on foot, but sometimes used roller skates, and have been predominantly men or women at various points.
The popular depiction of a carhop is of a waitress in roller skates with a tray of burgers, french fries, and milkshakes, and with other elements of 1950s American pop culture and fashion (historically accurate or not).