Definition of "hmm" []

• Indicating thinking or pondering. (interjection)
• To make a thoughtful humming noise. (verb)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "I can't wait to get to the, hmm, is chartreuse the correct term?"
• "Along with Radio4 (hmm, is there a theme emerging here?) it's worth the entirety of the licence fee and then some!"
• "If you thought that, instead of “hmm, is it possible I’ve been fed propoganda?”, then you are a victim of propoganda."