In an episode of the Graham Norton Show, Norton is speaking with Matthew McConaughey and Anne Hathaway. He asks Hathaway to tell them about her initial feelings about working with McConaughey. She is nervous to do so but agrees, saying:
I was excited to work with Matthew—yeah yeah, I mean who wouldn’t be? He’s amazing.
In this context, what part of speech would the word yeah be considered to be? I originally thought an interjection, but I am unsure.