doohickey

1. (slang, originally US) A thing (used in a vague way to refer to something whose name one does not know or cannot recall)Examples: "What does this doohickey do?"; "Customers will ask for "gizmos" and "what-cha-ma-call-its" and "doohickeys," and make crude drawings on paper bags of what it is they think they need."; "Besides, the show has invented a doohickey that makes it possible for Dr. Manhattan to exist as Calvin, a stable and supportive husband and father with no memory of his life as Jon Osterman, who can live out those 10 years as something close to a human being."Synonyms: Sorted by number of Google hits, widget, hickey, gizmo, thingy, gimmick, thingie, jiggerslang