an Dummy waiter is person that stand-in for someone which is not there on their regular duty.
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By any chance do you mean "Dumb Waiter"? if so, that is a very small elevator (about 2 ft x 2 ft) that carries food from a kitchen to a dining area.
Alternate answer:
I believe you are referring to a dumbwaiter. The term dumbwaiter can refer to couple of different things. It could be an elevator used to transport objects between two floors or it could refer to an auxiliary table or stand.
i dont know about split the dummy, but spit the dummy means to get mad about something.
dummy
If you mean dummy, like a manikin, I can't answer that. If you mean dummy, like idiot, the Japanese way to say it is baka. (ba-ka).
No dummy
dummy this dummy that hard questions no answers
baka, it means idiot or moron but it can mean dummy. Same thing really...
it means stupid dummy
It is a crust dummy
it means the waiter isn't qualified to do his job.
It means wide receiver. Dummy
a dummy
it means hoe dummy!