Phrasing I hear a lot is "what's this called" and "I forgot the name". (Ellipses indicate pausing while the question is answered.)
I need to hook the -- what's this called? ... Thanks, I need to hook the pipe to the sink.
I forgot the name. What's the thing you use to clean your teeth? ... Right, I need a new toothbrush while you're at the store.
I also hear "how do you say?" a lot (and the less-correct "how you say?").
I want to -- how do you say? I need to make it move ... Yes, I want to turn it on.
Technically, this should be "How do you say 'I need to make it move'?", with the question at the end of the sentence. But many times it seems more natural to use the inflection to end the sentence fragment, then start a new sentence describing what you want. Partially, this is because the early inflection more accurately describes your thought process of having a question first, then declaring the articulation of the question second. But it's also to be clear you want to translate a statement, not a question.
So I'm sure the grammarians cringe at that third example, but it seems fine to me.