 Jigambob is marked as obsolete in the dictionary, although thingamabob is still. Yes. Others like gizmo or doodah are still going strong, though. And you can even buy whatchamacallits and whoosiewatsits. They're chocolate bars made by Hershey's. Right. There are threads on Reddit dedicated to collecting placeholder words in English from around the world. They are worth exploring with gems like doomaflitchie, the Dutch huppeldepuppe,