A delivery man or delivery boy was someone who delivered goods from one location to another.
In 1953, Benny Russell asked Jimmy why he didn't get a job instead of selling items on the street. Jimmy gave the examples of a delivery boy and a dishwasher, saying he liked being his own boss and setting his own hours. (DS9: "Far Beyond the Stars")
The Earth movie Appointment with Danger featured a delivery man character who limped. In 2153, T'Pol dreamed she was watching the film on movie night on Enterprise NX-01, during which Doctor Phlox speculated that he might be the unidentified corpse, observing that he had never left the house. (ENT: "Impulse")
In 2327, Q masqueraded as a delivery man, bringing a bouquet of roses and baby's breath to "John Luck Pickard". Marta Batanides was miffed, believing the flowers to be "From one of your conquests, no doubt." (TNG: "Tapestry")