Green’s Dictionary of Slang

a waiter (cf. cold potato n.² ).

1909		J. Ware Passing Eng. of the Victorian Era.
1935		Thieves Slang ms list from District Police Training Centre, Ryton-on-Dunsmore, Warwicks 5: Hot potatoes: Table waiters.
1955		Index Jrnl (Greenwood, SC) 29 Nov. 5/4: Hot Potato — waiter.