Meaning

noun the basic unit of money in Vietnam

verb go `ding dong', like a bell

originUnknown. Perhaps suggested by dingus and other names for unnamable objects; perhaps suggesting of a sound of striking (perhaps the clapper of a bell; compare ding-dong); perhaps there is an element of donkey in it. First attested in the 1890s.

Etymology from Wiktionary, CC BY-SA 3.0