Hey there!
Bellboy is just another word for bellhop. Bellhops are those people at hotels that offer to carry your luggage for you up to your room and do other various tasks catered towards hotel guests.
An example sentence could be,
"I thought the bellboy would have trouble carrying my luggage considering how many rocks from my collection I brought with me, but he was able to pick my suitcase up without any problem."
Hope this helped you out! :-)
