Something unspecified whose name is either forgotten or not known.
1
Here, let's try turning this whatsis up a bit.
2
"Meantime," Max said to Ceil, "I guess you'd like to see the whatsis?"
3
"The whatsis?" I dimly remembered somebody mentioning that earlier.
4
"How much oil can you throw into the world market bringing it through that whatsis one barrel at a time?"
5
"Intell-whatsis?" she asked me.