something unspecified whose name is either forgotten or not known
"she eased the ball-shaped doodad back into its socket"
"there may be some great new gizmo around the corner that you will want to use"
a device or control that is very useful for a particular job
"That new kitchen gadget is such a handy gizmo for chopping onions quickly without making a mess."
Something, generally a device, for which one does not know the proper term.
"I can't fix your new electronic gizmo because I don't even know what it's supposed to do or how it works."