1. jborgmeyer26 says:

    I listened to this the other day on the air and did not even realize that I also say “mmmm Bye” when I end a phone call. It was mentioned that it could be that the “mmmm” part originates from “mmmm-hmmmm”, acknowledging the whole conversation. I would have to agree with that explanation as I am typically saying “Yes I got it, goodbye.” I just noticed that I did it today when I ended a call, and that acknowledgment was my intention. Funny that the guy who asked about the phrase was also from Omaha, NE where I reside. Thanks!