This word is derived from the word "waiter" or "waitress", and put together with the suffix "-tron".
Etymology of "-tron": Greek, suffix denoting an instrument; akin to Old English.
It is a dehumanizing term often used to refer to a waiter/waitress.
Dick goes into a restaurant and places a stack of one dollar bills on the table. Dick tells the waitron that this is his tip. If the waitron does bad, a dollar will be taken away. Good, a dollar put back. As his server slowly dissatisfies him, he removes the money from the tip pile. Waitron is saddened.