Well, you're right about the accent/emphasis on the first syllable. Maybe I should have said an accent on the first and the later syllables as marked. Now that you have raised this, I'm not sure but I know that there is an accent on the later syllable.

I'll also add whats-her-face, or whats-his-face, whoosywhatsit. The list goes on.

The father of a school friend of mine used to answer "what's that?" type questions with "a hoojar, a pippy, a pippy on the hoojar". I have never heard that from anyone else and I have no idea where the saying came from.