an object with an unknown name, or whose name could not be thought of at the moment it was needed.
see also thingymabob, thingymajig
hey bob, get that dohicky that changes the channel.
A word used to call something when you don't know or can't think of what to call it. examples; whotamawhatter, hidgedinky, watchamacallit, thingamajig, Dohickymajobber.
Could you get me that Dohickyover there?