a thing whose name one cannot remember, does not know, or does not wish to mention; a thingamy; hence, a useful implement, a gadget ...1963 colloq. rare
of uncertain origin;
possibly from oojib- (in oojiboo n. a thing whose name one cannot remember)
FIRST DOCUMENTED USE
1963 - see EXAMPLE below
"...Colourful words like ‘oobyjiver’, meaning ‘whatsis’ pop up regularly and inventive expressions like "He took it in like a dustbin" for "he believed every word I said" enrich the language..."
From: New Society Limited, Great Britain