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2.
What you say when someone speaks at you and you didn't hear what they said.
Person A: Do you want to have dinner with Jack and Jill tonight?
Person B: {looks up from book they were reading} Whosawhatsit?
by markds75 September 05, 2006
 
1.
An item that you cannot think of at the given moment. A Thingamajig. See Also widget.
Hand me that whosawhatsit over there. Not that one. The one next to the thingy with that thing on it.
by Jacob McClenahan June 21, 2005