doo-hickey
a way to describe an object when your mind is in such a clutter you can't remember its' name because you are pressed for time. similar in meaning to thing-a-ma-jig.
quickly, go over there and grab me the doo-hickey.
Doo hickey
A permanent knot on your head.
I got Molly whopped and now I have a permanent Doo hickey on my forehead.
Hickey-doo
pronoun used when you have no idea what the name of the thing you need is but still need it anyway.
Where is that hickey-doo that I just saw a minute ago.